Two adjacent coils have a mutual inductance of 200 mH. Find the emf induced in the secondary when the current through the primary is increased from 0 to 10 ampere in 10 millisecond.

Find the e.m.f induced in a 1 mH inductor through which the current decreases from 20 A to 10 A in 10 milli seconds.

The current through a 1mH inductor changes from 5 ampere to 10 ampere in 1 millisecond. Find the emf induced.

The mutual inductance between a pair of adjacent parallel coils is 0.1 henry. Find the emf induced across the ends of the second coil when the current in the first coil changes at the rate of 10 amp per sec.