First slide

Inductance

Question

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

Moderate

A

1 mH
B

10 mH
C

100 mH
D

1000 mH

Solution

Induced e.m.f ., $| e | = M \frac{di}{dt} \Rightarrow 100 \times 10^{- 3} = M (\frac{10}{0.1})$
$∴ M = 10^{- 3} H = 1 mH$

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