When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it?

When the current in a coil changes from 2 A to 4 A in 0.05 s, an e.m.f. of 8 V is induced in the coil. The coefficient of self-induction of the coil is

When the current changes fro +2A to -2A in 0.05 s, an e.m.f. of 8 V is induced in the coil. The coefficient of self-indution of the coil is

An e.m.f. of 250 muV is induced in a coil, when current in it changes from 10 A to 6 A in 0.4 s. What is the self inductance of the coil?

Two coils of wire A and B are placed mutaully perpendicular as shown in the figure. When current is changed in any one coil, will the current be induced in another coil?

If a magnet is held stationary and a coil is moved towards the magnet, will there be any induced e.m.f. produced in the coil?

Two circular coils A and B placed closed to each other.If the current in the coil A is changed,will some current be induced in coil B?Give reason

A coil A is connected to a voltmeter V and the other coil B to an alternating current source. If a large copper sheet C is placed between the two coils, how does the induced e.m.f. in the coil A change due to current in coil B?

A coil of metallic wire is stationary in non-uniform magnetic field. What is the e.m.f induced in the coil?