Electromagnetic Induction and Alternating Currents

One henry is equal to:

The self-inductance of a long air-cored solenoid of N turns, length l and cross-sectional area A is:

The current through an inductor of 2 H falls uniformly from 3 A to 1 A in 0.1 s. The magnitude of the induced emf is:

The energy stored in an inductor of 0.5 H carrying a current of 4 A is:

The number of turns of a long solenoid is doubled, keeping its length and area of cross-section unchanged. Its self-inductance becomes:

The mutual inductance between two coils is 0.5 H. If the current in the primary changes at 4 A/s, the emf induced in the secondary is:

Two coils have self-inductances of 4 mH and 9 mH and are perfectly coupled (coupling coefficient 1). Their mutual inductance is:

Self-inductance plays the same role in electrical circuits as:

Inductors of 3 mH and 6 mH are connected in parallel, placed far apart so that their mutual inductance is negligible. The equivalent inductance is:

A coil of inductance 0.2 H and resistance 10 Ω is connected to a battery. The time constant of the circuit is:

When an LR circuit is connected to a DC source, the current one time constant after switching on is about what percentage of its final value?

The mutual inductance of a pair of coils does NOT depend on:

The current in a coil of inductance 0.4 H changes at a rate of 50 A/s. Find the magnitude of the self-induced emf in volt.

Two coils have a mutual inductance of 0.25 H. The current in the first coil drops uniformly from 10 A to zero in 0.05 s. Find the emf (in volt) induced in the second coil.

An inductor stores 8 J of energy when it carries a current of 2 A. Find the emf (in volt) induced in it when the current changes at 3 A/s.