### Electromagnetic Induction

Electromagnetic Induction

These MCQs are intended for checking your Physics subject, Chapter Electromagnetic Induction knowledge.

The coupling co-efficient of the perfectly coupled coils is:

A choke is used as a resistance in :

The magnetic field is parallel to a surface, then the magnetic flux through the surface is :

The role of inductance is equivalent to:

If I current is flowing inductance L, then the dimension of 3/2 LI² is equivalent to:

The magnetic flux linked with a coil is inversely proportional to the?

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s-1 . If the horizontal component of earth’s magnetism is 2 × 10-5 T, then e.m.f. developed between the two ends of the conductor is:

A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is:

For purely capacitive circuits, power factor is:

The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:

The magnetic flux (∅) linked with a coil is related to the number of turns (N) of the coil as:

If the magnetic flux linked with a coil through which a current off ampere is set up is ∅, then the coefficient of self-inductance of the coil is:

Power factor of an ac circuit is a measure of:

The SI unit of magnetic flux is:

The magnetic flux (∅) lined with a coil is related to its area (s) as:

coil of L = 8.4 mH and R = 6 Ω is connected to a 12 V battery. The current in the coil is 1.0 A at approx time of:

An e and a p are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is: