Tap the board gently. In this page, you can find CBSE Class 10 Science Chapter 13 Extra Questions and Answers Magnetic Effects of Electric Current Pdf free download, NCERT Extra Questions for Class 10 Science will make your practice complete. MCQs from CBSE Class 10 Science Chapter 13: Magnetic Effects of Electric Current. Answer: These three effects cover almost everything we encounter in electronics. (b) When direction of current is perpendicular to the direction of magnetic field, the force experienced will be maximum. Now when coil is moved away, the magnetic field will decrease and so current induces in the opposite direction causing galvanometer to show deflection in opposite direction. The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically. A magnet is moving towards a coil as shown in figure. That doesn't apply in this case.There is always a down-side to using anything other than the equation proportions. What does the closeness of field lines in a magnetic field signify? An amp-meter mightnot be appropriate whenused in an exotic physics experiment. With the help of a diagram of experimental setup describe an activity to show that the force acting on a current carrying conductor placed in a magnetic field increases with increase in field strength.Answer:Aim : To show that force acting on a current carrying conductor placed in a magnetic field increases with the field strength.Apparatus Required : Aluminium rod, stand horse shoe magnet of different intensity, cell, key and connecting wires.Procedure :1. Electromagnetic Induction: The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The conventional current must be a flow of conventional charge, so first we should teach our students about the existence of oversimplified charges,"conventional charges," charges which we pretend are inside all the wires. (ii) Insert the thick wire through the centre normal to the plane of rectangular cardboard. Question. Answer: Magnetic field lines of the field produced by a current-carrying circular loop. The real charges are too complicated to deal with, and theadded complexity gets us very little information as long as we're only interested involtage drop, magnetic fields, and heating.Particle-flow is real, "Amperes" are notOnce we start ignoring the speed and direction of the charges, then we can easily build electrical instruments or"amp meters" which measure the Conventional Electric Current in terms of the magnetism which the charge-flow creates or by the voltage drop which appears across a resistor,or by the temperature rise being created in a calibrated pieceof resistance wire. If the forefinger shows the direction of the magnetic field and central finger that of the current, then the thumb will point towards the direction of motion of the conductor. But for more than 99% ofelectricity and electronics, the direction of the particles is irrelevant, and anammeter tells us the so-called"real" current while hiding the true particle flows.Or to put it simply: we pretend that"electric currents"are always composed of POSITIVE particles of unknown speed, so that any negative currentsare defined as positive particles flowing backwards ratherthan negative particles flowing forwards.Confusing students for two hundred yearsWe do cause some problems by choosing a positive charge convention. Now place the compass near its N pole of the magnet and marks the positions of needle of the compass. Name the alloy which is mainly used for making permanent magnets. During your painful experience there obviously was a considerable current directed through your body. An amp-meter mightnot be appropriate whenused in an exotic physics experiment. more closer the magnetic field lines more the strength of magnetic field. There is apowerful flow of electric charge going through the battery, yet no individual electrons flow through the battery at all. Question. 0% average accuracy. (b) (i) If the current is increased, the magnetic field strength also increases. And that trick holds the answerto the question.Electric currents produce three main effects: magnetism, heating, and the voltage drop across resistive conductors. Write one application for each of the following:(a) Right-hand Thumb Rule,(b) Flemings left Hand Rule,(c) Flemings Right Hand Rule.Answer:(a) It is used to find the direction of magnetic field in a coil of wire and electric current in a straight conductor. Initially the sides AD and BC of coil are parallel to magnetic field, so no magnetic force acts on them. The arms are pushed in opposite direction and coil continues to rotate in same direction. The negative atoms behave like electrons which are dragging an entire atom alongwith them.So, inside humanflesh which direction did the electric current REALLY go? Option (d). The closer the field lines, the stronger is the field. Thus, direction of current after every half rotation, direction of current changes. How many times does it change its direction in one second? How is magnetic field produced in a solenoid used? the electric current moves from positive terminal to negative of the battery . Answer:The force will act in upward direction given by thumb, if forefinger points in the direction of magnetic field and the middle finger points in the direction of current, according to Flemings left hand rule. In this video I am telling about Directions of electric. Electric motor. (b) Use of fuse. (iii) A current carrying curricular loop also produces magnetic field. When it is placed in a magnetic field then both fields interact each other, and current carrying conductor experience a force.Flemings left hand rule: If we stretch right hand thumb, forefinger and middle finger perpendicular to each other in such a way that forefinger points the direction of magnetic field, middle finger points the direction of current, then thumb will point the direction of force on the conductor. (b) The magnitude of the force is doubled. The nitrogen and hydrogen remain as gases even underthese high pressures, and can be recycle A brief summary of the Haber ProcessThe Haber Process combines nitrogen from the air with hydrogen derived mainly from natural gas (methane) into ammonia. Will there be a current induced in the coil if the magnet is rotated about its axis? Theylabor under the misconception that"Electricity" is made of negatively-charged particles called electrons. There's a genuine difference between the simplified pictureversus the actualparticle flows. This coil is free to rotate between the pole pieces of the magnet. Heating effect of currentb. (i) The magnetic lines of force start from north pole and terminate at south pole. What key K is pressed on.b. State the principle of an electric generator.Answer: An electric generator is based on the principle of electromagnetic induction. How many times does AC used in India change direction in one second? Adjust the hand in such a way that our mid finger points towards west (in the direction of current) and thumb points towards north (in the direction of force). What change in the deflection of the compass needle placed at a point near current carrying straight conductor shall be observed if the (a) current through the conductor is increased? It ensures that any leakage of current to the metallic body of an appliance keeps it potential same as of earth. If a hundred positive particles flow to the left per second, this givesexactlyas much magnetism, heating, and voltage as a hundrednegativeparticles flowing to the right per second. Question. On reversing the direction current, it will turn to 180 because its polarity will be reversed. The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points. Of course in metal wires outside thebattery, the real particle flow is only from negative to positive. In what respect it is different from generator? According to Flemings right hand rule, which part of right hand indicate the movement of conductor?Answer: Thumb. Question 3. Question. Chapter 13 Science Class 10 Extra Questions Question 8. Question. Extra Questions Of Magnetic Effect Of Electric Current Class 10 Question 9. Write SI unit of magnetic field. However, 400 - 450C isn't a low temperature!Rate considerationsThe lower the temperature you use, the slower the reaction becomes. Then we can use thesemeters everywhere. Name and state the phenomenon responsible for the above observation. The divergence, that is, the falling degree of closeness of magnetic field lines indicates the fall in strength of magnetic field near and beyond the ends of the solenoid. Ourown nervous system is based on the two-way currents. But the"electricity" in common electrical devices is limited to positive protons andnegative electrons. The only difference between a DC generator and an AC generator is in the way the two ends of the generator coil are connected to the outer circuit. The current in your flesh was a flow of positive sodium and potassium atoms, negative chlorine, and numerous other more complexpositive and negative molecules. We makethe negative particles positive,then add their current to any positive particles which were flowing forward. In the following list of devices-materials, the electric charges found within the conductors are a combination of movable positive and negative particles. (ii) It also depends upon the direction of current flowing through the conductor. The current in your flesh was a flow of positive sodium and potassium atoms, negative chlorine, and numerous other more complexpositive and negative molecules. However,no electronsflowed through your body at all. How will the deflection of the compass get affected if the current in the wire is increased? It allows us to understand partsof physical science which otherwise might be too complicated to imagine. Question. Electric current can be complicated!However, there isa cute trick we can pull in order to avoid having to look at the particles at all. A Coil of wine having area 0.9 m2 is placed in a uniform magnetic field 2 10-2 weber/m2. (ii) To find the direction of force experienced by a current carrying straight conductor placed in amagnetic field we make use Flemings left hand rule. Two coils A and B of insulated wires are kept close to each other. Question. The Amps would not quite match avisual picture of moving particles.But if we truely believe that the amperes are real,we might start to doubt the existence of flowing charges. Actually, in some conductors the electric currents area flow of genuinely positive charges, while in others the flows are indeed negative particles. Hint: The direction of current is in the direction in which positive charges would flow or opposite to the direction in which negative electrons would flow. (b) Two coils P and S are wound over the same iron core. )PSThis over-simplified fake electric current measured by ammeters is commonly called"Conventional Current." the ratio of the emfs of the two cells will be, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Electronics teachers and authorsof textbooksare often chided for passing on an "error" to their students. These threetypes of meter will agree that a"current" is a"current" regardless of the particle polaritiesand flows. The direction of pressure flow is opposite to the direction of flow of water Question. We ignore their speed, and instead measure only the flow rate: the number of charges flowing per second. Question 2. of turns 50 and 100 respectively. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. Question. strength of the magnetic fieldc. What is the role of the split ring in an electric motor?Answer: In electric motor, the split ring acts as commutator. c. Using a fuse in a household . Answer: The magnetic field may change due to relative motion between the coil and the magnet. At the ends of solenoid, magnetic field strength is half to that inside it. is preferred over D.C. because it can be transmitted over long distance without much loss of energy.D.C. An alternating electric current has a frequency of 50 Hz. (grin! Question. Direction of electric current class 10 in hindi | How the current flow in a wire class 10 in hindi - YouTube Hello friends! That will causethe pressure to fall again.In order to get as much ammonia as possible in the equilibrium mixture, you need as high a pressure as possible. The electric charges in a human body are entirely composed of positive and negative chargedatoms or "ions." It cannot detect real current, instead itonly measures our conventionally-defined simple current. (ii) What happens if coil P is moved away from Q? Question. Name and state the rule used for determination of direction of this force.Answer:Around a current carrying conductor a magnetic field is produced. The real charges are too complicated to deal with, and theadded complexity gets us very little information as long as we're only interested involtage drop, magnetic fields, and heating.Particle-flow is real, "Amperes" are notOnce we start ignoring the speed and direction of the charges, then we can easily build electrical instruments or"amp meters" which measure the Conventional Electric Current in terms of the magnetism which the charge-flow creates or by the voltage drop which appears across a resistor,or by the temperature rise being created in a calibrated pieceof resistance wire. Then we can use thesemeters everywhere. (b) If a coil is moved in magnetic field, then again an induced current is set up in the coil. What is meant by overloading of an electrical circuit?Explain two possible causes due to which overloading may occur in household circuit. State the direction of magnetic field in the followingcase: Answer:Perpendicular to both current and force on the conductor outward the plane of paper. In the following list of devices-materials, the electric charges found within the conductors are a combination of movable positive and negative particles. (ii) How will you prove the phenomena of EMI.Answer: (i). (i) When north pole is pushed into the coil, a momentary deflection is observed in the galvanometer. A brief summary of the Haber ProcessThe Haber Process combines nitrogen from the air with hydrogen derived mainly from natural gas (methane) into ammonia. What is a solenoid? Domestic Electric circuits: In our houses, we receive AC electric power of 220 V with a frequency of 50 Hz. Question.Consider a circular loop of wire lying in the plane of the table. On which effect of electricity does fuse work? And these three effectsdon't careabout the amounts of positive and negative particles, or about their speed, their mass, their charge, etc. (iii) For finding the direction of current induced in a coil we use Flemings right hand rule. An electron enters a magnetic field at right angles to it as shown in fig. The direction of magnetic field below and above the wire is opposite so deflection in compass needle changes as well i.e, the deflection is reverse direction. But to measure currents, won't we first need to measure how much of the current is composed of negative particles going one way, and of positive particles the other? What is an electric circuit? (b) An air conditioner of 2 kW is used in an electric circuit having a fuse of 10 A rating. The deflection increases. But the"electricity" in common electrical devices is limited to positive protons andnegative electrons. Such a person should be provided with an insulated support like wood, plastic or rubber in order to disconnect the person from wire. On applying Flemings left-hand rule we find that force acting on arm AB due to magnetic field pushes it downwards. Choose the incorrect statements from the following regarding magnetic lines of field. So, during the time when the charges flow between the two plates of the battery, what's therealdirection? It is shown by the deflection in galvanometer. The linkgives 16,000 google hits. There is a simple answer, but firstBatteries are another example of non-electron or "ionic" conductors. (b) Principle of working of electric motor: A currentcarrying coil placed in a magnetic field experience a torque. Define a solenoid. (vi) Now pass the current in the rod from B to A. (b) towards east. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. During an electric current, both varieties of particles are flowing past each other in opposite directions.TWO-WAY POS/NEG ELECTRIC CURRENTS CAN EXIST IN:*.batteries*.human bodies*.all living organisms*.acids (mostly protons flow)*.the ground*.the ocean*.the sky (ionosphere)*.electrolytic capacitors*.aluminum smelters*.liquid mercury and solder*.ion-based smoke detectors*.electroplatingtanks*.fuel cells' proton conductor and "solid acid" membranes*.electrophoresis gels in research (esp. When live wire touches the metallic appliance then electric current flows through castling to the earth instead of human body and thus weprevent ourselves from getting shock. Question. Might we eventually start believing that this oversimplified concept of positive electric current is REAL? Ourown nervous system is based on the two-way currents. Yet something is missing! Whenever you connect a lightbulb to a battery, you form a complete circuit, and the path of the flowing charge isthroughthe inside of the battery, as well as through the light bulb filament and the connecting wires. What is indicated by crowding of magnetic field lines in a given region?d. How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire? This current will flow in the external circuit in the direction as shown in Fig. Question. Do we follow the negative particles and ignore the positive ones? We have listed 100 of the most interesting health topics in 2022. find the direction of magnetic field produced for a given direction of current in the conductor.Name and state the rule to find the direction of magnetic field associated with a current carrying conductor. Question. Magnetic field lines: These charged particles are moving in the magnetic field which experiences force.The current carrying conductor has its own magnetic field, when it superimpose the magnetic field of magnet. But the force acting on arm CD pushes it upwards. The current in your flesh was a flow of positive sodium and potassium atoms, negative chlorine, and numerous other more complexpositive and negative molecules. Adding a catalyst doesn't produce any greater percentage of ammonia in the equilibrium mixture. A magnetic compass shows a deflection when placed near a current carrying wire. number of turns of the coil?Answer:a. (c) Describe an activity to demonstrate the direction of the magnetic field generated around a current carrying conductor. The word piezoelectricity means electricity resulting from . more current more force on a current carrying conductor in a magnetic field. Due to this the side AB of the coil is pushed down and side CD is pushed up. (b) Too many appliances should never be connected to a single socket. Whenever you connect a lightbulb to a battery, you form a complete circuit, and the path of the flowing charge isthroughthe inside of the battery, as well as through the light bulb filament and the connecting wires. Electric current can be complicated!However, there isa cute trick we can pull in order to avoid having to look at the particles at all. Question. Orvice versa, following the positives? Answer: It states that if we stretch the thumb, forefinger and middle finger of our right hand such that they are mutually perpendicular to each other. Identify the type of magnetic field represented by the magnetic field lines given below and name the type of conductors which can produce them. Nope, wrong. We makethe negative particles positive,then add their current to any positive particles which were flowing forward. = 3 3.2 10-19 106 sin 60 What is the frequency of ac in India?e. The magnetic field around a current carrying conductors forms a pattern of concentric circles. Question 4. Teachers promote the(wrong?) No google hits! Might we eventually start believing that this oversimplified concept of positive electric current is REAL? Thisfundamental errorleads most peopleto imagine that electric currents arealwaysa flow of negative particles. However,no electronsflowed through your body at all. DNA testing)*.air cleaners, smoke precipitators, air ion flows*.particle beams*.the vertical"sky current" in the atmosphere*.gas discharge, which includes:*.electric sparks*.fluorescent tubes*.sodium and mercury arc streetlights*.neon signs*.the Earth's Aurora*.lightning and corona discharges*.arc welders*.Geiger counter tubes*.thyratron tubes*.mercury vapor rectifiersThis list is not so short. These various conductors are nothing exotic. No google hits! [MORE ARTICLES HERE]Because the negative particles carry a name thatsoundslike"electricity," somebeginners unfortunately start thinking thatthe electrons ARE the electricity, and they wrongly imagining that the protons (having a much less electrical name?) The split rings touch the two strips of graphite B1, B2; these strips of graphite are called the brushes. Write down a short note on magnetic field produced by a solenoid. Question. That will causethe pressure to fall again.In order to get as much ammonia as possible in the equilibrium mixture, you need as high a pressure as possible. Battery electrolyte is veryconductive. These three effects cover almost everything we encounter in electronics. The conventional current must be a flow of conventional charge, so first we should teach our students about the existence of oversimplified charges,"conventional charges," charges which we pretend are inside all the wires. (ii) resistance for a given current and (iii) time for which the current flows through the resistor.H = I2RtSo, when current in the circuit increases, the wire with low melting point in it melts to the heat generated.Hence, the circuit breaks and electrical devices and appliances are saved. That increases your capital costs when the plant is built.High pressures cost a lot to produce and maintain. These split rings are mounted on the shaft of the motor and can rotate with the shaft. The reaction is reversible and the production of ammonia is exothermic.A flow scheme for the Haber Process looks like this:Some notes on the conditionsThe catalystThe catalyst is actually slightly more complicated than pure iron. Answer: Principle: It works on the basis of electromagnetic induction. (b) use of fuse. Question 26. (And if we should builda circuit entirely out of hoses full of salt water, withno metal conductors used,thenallthe current would be bi-directional. (ii) is affected by changing the direction of flow of current in the conductor?Answer:(i) The strength of magnetic field around a straight current conductor increases on increasing the strength of current in the conductor or vice versa. Justify your answer. Answer: Result: Magnetic field lines can be drawn around a bar magnet using a magnetic compass. (i) If magnitude of current is doubled, then force is doubled. (ii) used in electric bells. Battery electrolyte is veryconductive. Youwould do this if it is particularly important to use up as much as possible of the otherreactant - if, for example, it was much moreexpensive. If two magnetic field lines would intersect each other then at the point of intersection there would be two different directions of magnetic field which is not possible.c. Yes, but weonlyneed this information if we want to knoweverythingabout the electriccurrent. Horizontal component of earths magnetic field at a place is uniform and its direction is south to north. (a) What is meant by a magnetic field? if compass is moved away from the conductor?Answer:a. We stop thinking of current as being a flow of real physical particles. The phenomenon in which a changing magnetic field in a coil induces a current in another coil kept near it. We ignore their speed, and instead measure only the flow rate: the number of charges flowing per second. (ii) Circuit of bulb B2 is incomplete. (b) Why is it preferred over the other type? Consider two points A and B at equal distances from the wire, respectively above and below it. Class 10 Science Ch 13 Extra Questions Question 1. Imagine the flows as being like crowdsof of tiny moving dots, with half the dots going in one direction andhalf in the other. Fix a cardboard and insert a wire to pass through its centre normal to the plane of the card board.Sprinkle iron filings on card board uniformly. Yet something is missing! We might start tosee "Electric Current" itself as a sort of abstract,invisible, difficult-to-imagine thing. Where it is connected in a circuit?Answer: An electric fuse is a safety device which is made up of a wire made of copper or aluminum or a tin lead alloy. Question. Assertion (A): On changing the direction of flow of current through a straight conductor, the direction of a magnetic field around the conductor is reversed. Two coils C1 and C2 are wrapped around a nonconducting cylinder. (b) Near the poles magnetic field lines are closer than the middle of a bar magnet. The conventional current must be a flow of conventional charge, so first we should teach our students about the existence of oversimplified charges,"conventional charges," charges which we pretend are inside all the wires. Write any one method to induce current in a coil.Answer:By moving a magnet towards the coil or vice versa, current can be induced in the coil. Strength of magnetic field is doubled when theradius of the loop is halved B 1/F, Question. In reality the electrons andprotons carry electric charges ofequalstrength.If electrons are"electricity", then protons are"electricity" too.Now everyone will rightly tell methat the protons within wires cannot flow, while the electrons can. Not right to left, not left to right, but inboth directions atonce. Whenever the magnetic field lines linked with a coil change due to relative motion of a magnet and the coil, an induced current is produced in the coil. Question. By convention, we define the flowing charges to be positive. What is a solenoid? State the condition for electromagnetic induction to take place. [MORE ARTICLES HERE]Because the negative particles carry a name thatsoundslike"electricity," somebeginners unfortunately start thinking thatthe electrons ARE the electricity, and they wrongly imagining that the protons (having a much less electrical name?) You can't go far wrong in an exam quoting 200 atmospheres.RecyclingAt each pass of the gases through the reactor, only about 15% of the nitrogen andhydrogen converts to ammonia. Name any three factors on which the magnitude of the magnetic field due to solenoid depends.Answer:Factors on which the magnitude of the magnetic field due to solenoidsa. They are very common, they allaround us; as close to us as they can possiblybe.Non-electron Charge-flowFor example, if you were to poke your fingers into the back of an old-style television set, you would suffer a dangerous or lethal electric shock. The current through the solenoid should be direct current. All we care about is the total net charge which moves past a particular point in the circuit. Does the AC generator have any slip ring? A beam of alpha particles enters a chamber moving along the magnetic field. Question 1. Explain the underlying principle and working of an electric generator by drawing a labeled diagram. The current in your flesh was a flow of positive sodium and potassium atoms, negative chlorine, and numerous other more complexpositive and negative molecules. Question. Given: A = 0.9 m2, B = 2 10-2 Wb/m2 During the electric current, the positive atoms flowed in one direction, while the negative atoms simultaneously flowed in the other. Question. During your painful experience there obviously was a considerable current directed through your body. (i) MRI or Magnetic Resonance Imaging is based on magnetic effect of electric current. Explain the principle, construction and working of an electric motor with a help of labeled diagram?Answer: Principle it is based on the principal that a current carrying conductor placed perpendicular to the magnetic field experiences a force.Construction-(i) Armature or coil- It consist of an insulated copper wire wound on a soft iron core. Which of the above observation of the student appears to be wrong and why? Electric current can be complicated!However, there isa cute trick we can pull in order to avoid having to look at the particles at all. Write one application of each of the following:(a) Right-hand thumb rule (b) Flemings left hand rule(c) Flemings right hand ruleAnswer:(a) Right-hand thumb rule is used to find the direction of magnetic field in a coil of wire and the electric current in a straight conductor. Magnetic field has both direction and magnitude. are not electrical. The nitrogen and hydrogen remain as gases even underthese high pressures, and can be . The magnitude of the magnetic field produced at a given point increases as the current through the wire increases. #Magnetic Effects of Electric Current Class 10 Notes. Charge actually comes in two varieties: positive particles and negative. Assume that the current through the loop is anticlockwise.Answer:(a) Fix a cardboard and pass through its centre a thick copper wire AB connected with a cell of 12 V through a rheostat, an ammeter and plug key as shown in figure. Why does a current carrying conductor kept in a magnetic field experience force?What is the direction of force acting on the conductor?Answer: A current carrying coil contains charged particles which experiences a force (Bqv). The centre finger indicates the direction of current & thumb gives the direction opf the force of motion. Track your progress, build streaks, highlight & save important lessons and more! The flowing negativesand positives are usually not equal,and the speed of the positives in one direction is usually not the same as the speed of the negatives in the other. A circuit over load occurs when the amount of current flowing through the circuit exceeds the rating of the protective device. Draw inference from your observations. We makethe negative particles positive,then add their current to any positive particles which were flowing forward. (And if we should builda circuit entirely out of hoses full of salt water, withno metal conductors used,thenallthe current would be bi-directional. Question. In India, the alternating current changes direction after every \(\frac {1}{100}\) second, so the frequency of alternating current is 50 Hz. During an electric current, both varieties of particles are flowing past each other in opposite directions.TWO-WAY POS/NEG ELECTRIC CURRENTS CAN EXIST IN:*.batteries*.human bodies*.all living organisms*.acids (mostly protons flow)*.the ground*.the ocean*.the sky (ionosphere)*.electrolytic capacitors*.aluminum smelters*.liquid mercury and solder*.ion-based smoke detectors*.electroplatingtanks*.fuel cells' proton conductor and "solid acid" membranes*.electrophoresis gels in research (esp. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. Suggest one way of discriminating a wire carrying current from a wire carrying no current.Answer:When a magnetic compass is brought near a current carrying conductor it will be deflected. Let current is from west to east. While trying to understand electric circuits and electrical measurements, we need a simpleway to take measurements of this important entity named"Electric Current." All metals are composed of positively charged atoms immersed in a sea of movable electrons. C. If magnetic field lines are parallel and equidistant, they represent zero field strength. It won't paint the correct picture when designing electron beams inside vacuum tubes, or ion flows in nerve fibers. Again observe the motion of rod.Observations : Each time, the conductor moves faster than that of previous one. Describe some salient features of magnetic lines of field concept. Question sources produce alternating current?Answer: A.C. generator and common inverter used in houses for emergency power supply produce alternating current. Orvice versa, following the positives? But inside the battery's wet electrolyte, the charge-flow goesin two opposite directions at the same time. Answer: The displacement of the rod in the above activity suggests that a force is exerted on the current-carrying aluminium rod when it is placed in a magnetic field. Answer: Magnetic field lines are the imaginary lines drawn in a magnetic field along which a north magnetic pole would move. Question. Conventionally, in an electric circuit the direction of electric current is taken as opposite to the direction of the flow of electrons, which are negative charges. distance of point P from the coil?c. Question 9. Answer: If a hundred positive particles flow to the left per second, this givesexactlyas much magnetism, heating, and voltage as a hundrednegativeparticles flowing to the right per second. Direct current is produced by sources such as batteries, thermocouples, solar cells, and commutator -type electric machines of the dynamo type. (ii) After some time current reaches maximum and becomes constant in P coil. This happens due to the damage in insulation of the power lines.Safety measure device: Fuse.Working principle of fuse: It works on the heating effect of electric current or Joules law of heating.According to this law, the heat produced in a resistor is directly proportional to the (i) square of current for a given resistance. How should these be changed to decrease magnetic field at a point?Answer:(a) The direction of deflection of a magnetic compass needle depends upon the direction of the magnetic field at that point. Thisfundamental errorleads most peopleto imagine that electric currents arealwaysa flow of negative particles. When is the force experienced by a current-carrying conductor placed in a magnetic field largest?Answer: When the length of current-carrying conductor and direction of magnetic field are perpendicular to each other, the maximum force is experienced by the current-carrying conductor. If the current in the coil A is changed, will some current be induced in the coil B? (And if we should builda circuit entirely out of hoses full of salt water, withno metal conductors used,thenallthe current would be bi-directional. Briefly explain an activity to plot the magnetic field lines around a bar magnet. Question. Write oneimportant advantage of using alternating current. The linkgives 16,000 google hits. )PSThis over-simplified fake electric current measured by ammeters is commonly called"Conventional Current." For example, what happens if we all spend many years thinking in terms of such simplified"electric current?" The frequency of AC in India is 50 Hz and in each cycle it alters direction twice. Magnetic Effects Of Electric Current Class 10 Extra Questions Question 4. The magnetic force on the electron will act (a) vertically upwards. Thisfundamental errorleads most peopleto imagine that electric currents arealwaysa flow of negative particles. Answer:A coil of many circular turns of copper wire wrapped in the shape of a cylinder, is called a solenoid.The magnetic field lines in a solenoid, through which current is passed, is very similar to that of a bar magnet. Do we follow the negative particles and ignore the positive ones? But the"electricity" in common electrical devices is limited to positive protons andnegative electrons. Name two safety measures commonly used in electric circuits and appliances.Answer: Two safety measures are:(a) use of earth wire and proper earthing. When is the force experienced by a current carrying conductor placed in a magnetic field greatest?Answer:When the current in the conductor flows perpendicular (90) to the direction of the magnetic field, maximum force is generated. (a) Write the values of the following physical quantities in connection with domestic power supply in our country: (i) potential difference between live wire and neutral wire. We might start tosee "Electric Current" itself as a sort of abstract,invisible, difficult-to-imagine thing. (b) Given P = 2 kW and V = 200 volt,Power, P = VI I =p/vI = 2000/220 =9.09 AThe rating of the fuse wire is 10 A which is greater than current drawn by air conditioner so when air conditioner is switched on, fuse will not blow off. The alternating current (A.C.) reverses its direction periodically whereas the direct current (D.C.) always flows in one direction.A.C. The flowing negativesand positives are usually not equal,and the speed of the positives in one direction is usually not the same as the speed of the negatives in the other. Imagine the flows as being like crowdsof of tiny moving dots, with half the dots going in one direction andhalf in the other. Again I askyou, what is the REAL direction ofelectric currents?We cannot solve the problem by belittling it, or by pretending that two-way currentspertain only to something exotic, or pretendthat it's all completely separate from everyday life. A coil made of insulated copper wire is connected to a galvanometer. (a) reversing the direction of floe of floe of current (b) doubling the magnitude of current.Answer: The direction of earths magnetic field is from U-south to 0-north. The field lines inside the solenoid are in the form of parallel straight lines. Nobody talks about the "Conventional Charge!" On what effect of an electric current does an electromagnet work? Magnetic field: If we did this, then"conventional current" would bemuch easier to accept, no? Giving reason explain where is the field more at A or at B.Answer:The direction of magnetic field due to current at A is from north to south and at B from south to north.Therefore, at A earths magnetic field and field due to current are in opposite direction and at B earths magnetic field and magnetic field due to current are in same direction. Yes, this is true but only true for metals. Write down advantage of AC over DC? That means that the gases are going into the reactor in the ratio of 1 molecule of nitrogen to 3 of hydrogen.That is the proportion demanded by the equation.In some reactions you might choose to use an excess of one of the reactants. (b) Field strength is directly proportional to the number of turns in the coil. Direction of electric current is negative charge to positive charge. There's a genuine difference between the simplified pictureversus the actualparticle flows. )Two-way currents are commonThere are many other places where these kinds of positive/negativecharge flows canbe found. it's +ve and -ve charge attract each other.And electrons move to those directions where current flows. The magnitude of magnetic field is directly proportional to the strength of the electric current flowing in the wire. But when we see the flow of water it is the flow of mass and mass cannot be negative so, there is no analogous statement. Ammonia is easily liquefied under pressure as long as it isn't too hot, and so the temperature of the mixture is lowered enough for the ammonia to turn to a liquid. (grin! According to Fleming's left-hand rule, the thumb points in the direction of the force exerted on the conductor, the forefinger points in the direction of the magnetic field, and the middle finger points in the direction of the current when the thumb, forefinger, and middle finger are held perpendicular to each other. It consists of a rotating armature ABCD containing coils of wire, pole pieces, brushes and as commutator. In reality the electrons andprotons carry electric charges ofequalstrength.If electrons are"electricity", then protons are"electricity" too.Now everyone will rightly tell methat the protons within wires cannot flow, while the electrons can. The catalyst ensures that the reaction is fast enough for a dynamic equilibrium to be set up within the very short time that the gases are actually in the reactor.Separating the ammoniaWhen the gases leave the reactor they are hot and at a very high pressure. The flowing negativesand positives are usually not equal,and the speed of the positives in one direction is usually not the same as the speed of the negatives in the other. What does it mean? Answer:(i) The strength of magnetic field will increase. So Minimum at point B; Maximum at point A. 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