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Q.

Two circuits have mutual inductance of 0.1 H. What average e.m.f. is induced in one circuit when the current in the other circuit changes from 0 to 20 A in 0.02 s?

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a

240 V

b

230 V

c

100 V

d

300 V

answer is C.

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Detailed Solution

|e|=Mdidt⇒|e|=0.1×(20-0)0.02=100 V
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