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Question

Define coefficient of mutual induction. If in the primary coil of a transformer, the current decreases from 0.8A to 0.2A in 4 milliseconds, calculate the induced e.m.f in the secondary coil. Mutual inductance is 1.76H.

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Solution

Coefficient of mutual induction:-
It is a measure of the induction between two circuits, It is the ratio of the electromotive force in a circuit to the corresponding change of current in neighboring circuit; usually measured in henries.
In given circuit,
I1=0.8,I2=0.2,Δt=4×103,M=1.76
But,
Induced emf=Vind=M×I1I2Δt

Vind=1.76×0.80.24×103

Vind=264V

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