First slide

Inductance

Question

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

Moderate

A

240 V
B

230 V
C

100 V
D

300 V

Solution

$e = M \frac{d i}{d t} \Rightarrow e = 0.1 \times \frac{(20 - 0)}{0.02} = 100 V$

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