First slide

Inductance

Question

A varying current in a coil changes from 10 A to zero in 0.5 s. If average e.m.f. induced in the coil is 220 volts, the self-inductance of coil is

Moderate

A

5 H
B

10 H
C

11 H
D

12 H

Solution

$| e | = L \frac{di}{dt} \Rightarrow 220 = L \times \frac{10}{0.5} \Rightarrow L = 11 H$

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