A coil has a self inductance of 10 mH. What is the maximum magnitude of the induced em.f. in the inductor, when a current I = 0.1 sin 200 t A is sent through it?

Show that energy stored in an inductor L, when a current is f established through it, is 1/2( LI ^2).

A coil has an inductance of 1.5 xx 10^-2 H. Calculate the e.m.f. induced, when current in the coil changes at the rate 200 ampere per second.

A closely wound coil of 100 turns and area of cross-section 1cm^(3) has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2A flows in it, will be

Current changes in time interval 5 s from 7 A to 2 A in a coil of self inductance 0.1 H. Find the value of induced e.m.f. and the direction of induced current in the coil.

Define the term self-inductance of a solenoid. Obtain the expression for the magnetidc energy stored in an inductor of self-inductance L to build up a current I through it.

A long solenoid of length 1 m, cross sectional area 10 cm^2 , having 1000 turns has wound about its centre a small coil of 20 turns. Compute the mutual inductance of the two circuits. What is e.m.f. in the coil when the current in the solenoid chanages at the rate of 10 As^-1 ?

A coil has an inductance 0.7 H and is joined in series with a resistance of 220 ohm. Find the wattles component of the current in the circuit, when an alternating e.m.f. of 220 V at a frequency of 50 hz is supplied to it.

A coil of wire of certain radius has 600 turns and a self inductance of 108 mH. What will be the self inductance of a similar coil, which has 500 turns?