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Q.

An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be

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a

1 millihenry

b

10 millihenry

c

100 millihenry

d

1000 millihenry

answer is A.

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Detailed Solution

Induced e.m.f. e=Mdidt⇒100×10−3=M100.1∴ M=10−3H=1 mH
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