EMF in Physics Multiple Choice Questions (MCQ) PDF Download

MCQ 1: Square coil of side 16 cm having 200 turns rotating in magnetic field of 0.05 T with peak EMF of 12 V will produce angular velocity of

1. 47 rad s^-1
2. 49 rad s^-1
3. 42 rad s^-1
4. 48 rad s^-1

MCQ 2: Whenever magnetic flux linked with a coil changes, the induced EMF in the circuit will change

1. for a short time
2. for a long time
3. forever
4. as long as change in flux

MCQ 3: An EMF of 5.6 V is induced in a coil while current in coil is decreased from 100 A to 20 A in 0.02 s, its mutual induction will be

1. 1.4 × 10^-3
2. 2.4 × 10^-3
3. 3.4 × 10^-3
4. 4.4 × 10^-3

MCQ 4: Back EMF is 120 V when motor is turning at 1680 revs per min. The back EMF when motor rotates at 3360 revs per min, will be

1. 220 V
2. 240 V
3. 260 V
4. 280 V

MCQ 5: Michael Faraday observed that EMF was set up in a conductor in the year of

1. 1831
2. 1832
3. 1840
4. 1842