Electromagnetic Induction MCQ Questions and Answers for Practice

1. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called

1. electromagnetic induction
2. lenz's law
3. hysteresis loss
4. kirchhoff's laws

2. In electromagnetic induction, the induced charge is independent of

1. change of flux
2. time.
3. resistance of the coil
4. None of these

3. An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of

1. the strength of the magnet
2. number of turns of coil
3. the resistivity of the wire of the coil
4. speed with which the magnet is moved

4. According to Faraday's law of electromagnetic induction

1. electric field is produced by time varying magnetic flux.
2. magnetic field is produced by time varying electric flux.
3. magnetic field is associated with a moving charge.
4. None of these.

5. A moving conductor coil produces an induced e.m.f. This isin accordance with

1. Lenz's law
2. Faraday's law
3. Coulomb's law

6. A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because

1. the induced current is produced
2. the coil acts like a magnet
3. the number of turns in the coil of the galvanometer are changed
4. None of these

7. The polarity of induced emf is given by

1. Ampere's circuital law
2. Biot-Savart law
3. Lenz's law
4. Fleming's right hand rule

8. The self inductance of a coil is a measure of

1. electrical inertia
2. electrical friction
3. induced e.m.f.
4. induced current

9. The coils in resistance boxes are made from doubled insulated wire to nullify the effect of

1. heating
2. magnetism
3. pressure
4. self induced e.m.f.

10. Two pure inductors each of self inductance L are connected in series, the net inductance is

1. L
2. 2 L
3. L/2
4. L/4

11. Lenz's law is a consequence of the law of conservation of

1. charge
2. mass
3. energy
4. momentum

12. A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is

1. larger in case (i)
2. smaller in case (i)
3. equal to both the cases
4. larger or smaller depending upon the radius of the coil

13. The laws of electromagnetic induction have been used in the construction of a

1. galvanometer
2. voltmeter
3. electric motor
4. generator

14. Two coils are placed closed to each other. The mutual inductance of the pair of coils depends upon

1. the rate at which currents are changing in the two coils.
2. relative position and orientation of two coils.
3. the material of the wires of the coils.
4. the currents in the two coils.

15. Two identical coaxial circular loops carry a current i each circulating in the same direction. If the loops approach each other, you will observe that the current in

1. each increases
2. each decreases
3. each remains the same
4. one increases whereas that in the other decreases