Electromagnetic...

If a current of 3.0 amperes flowing in the primary coil is reduced to zero in 0.001 second, then the induced e.m.f. in the secondary coil is 15000 volts. The mutual inductance between the two coils is

An e.m.f. of 12 volts is induced in a given coil when the current in it changes at the rate of 48 amperes per minute. The self-inductance of the coil is

A closely wound coil of 100 turns and area of cross-section 1 cm² has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2 A flows in it, will be

In the following circuit, the bulb will become suddenly bright, if

Two pure inductors each of self-inductance L are connected in parallel but are well separated from each other. The total inductance in

Self-induction of a solenoid is

Mutual inductance of two-coils can be increased by

In a choke coil, the resistance X_L and resistance R aresuch that

The number of turns of primary and secondary coils of a transformer are 5 and 10 respectively and the mutual inductance of the transformer is 25 henry. Now the number of turns in the primary and secondary of the transformer are made 10 and 5 respectively. The mutual inductance of the transformer in henry will be

A current I = 10 sin (100 π t) A is passed in first coil, which induces a maximum e.m.f. of 5 πV in second coil. The mutual inductance between the coils in