Why induced emf is called back emf?

What is back emf?

What is induced e.m.f.?

The current in a coil changes from 0 to 20 A in 0.5S. If the induced emf is 80V, the self inductance of the coil is

Whenever the magnetic flux linked with a coil changes,then an induced e.m.f. is produced in the circuit. This e. m. f. lasts

Define mutual inductance. Derive formula for the induced e.m.f. in the coil due to mutual inductance.

The current in one coil increasesfrom0 to 500 mA in 0.1 ms. The induced emf in the second coil is 500 V. Calculate the mutual inductance between the two coils.

If the rate of change of current in primary coil is doubled,the induced e.m.f. in secondary coil will become

The current in the coil changes from 3A to 6 A in 3sec. If the induced e.m.f. in the coil is 60 V, then self inductance of the coil is

A current through a coil of self inductance 10 mH increases from 0 to 1 A in 0.1 s. What is the induced emf in the coil?

The self inductance of a coil is 5 H, a current of 1 A change to 2 A within 5 second through the coil. The value of induced e.m.f. will be