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Q.

The mutual inductance of a pair of coils is 0. 7 5 H. If current in the primary coil changes from 0.5 A to zero in 0.01 s find average induced e.m.f. in secondary coil.

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a

37.5V

b

22.5V

c

18.2V

d

25.5V

answer is A.

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Detailed Solution

Given,

M= 0.75 H

I = 0.5 A

f = 0.015

According to emf 

e=MdIdt=0.75×0.50.01=37.5V

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