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Questions  

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is 

a
12.5 V
b
64.0 V
c
0.016 V
d
100.0 V

detailed solution

Correct option is D

e=Mdidt=1.25×80=100 V

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