First slide

Inductance

Question

The average e.m.f. induced in a coil in which a current changes from 0 to 2 A in 0.05 s is 8 V. The self inductance of the coil is

Moderate

A

0.1 H
B

0.2 H
C

0.4 H
D

0.8 H

Solution

$e = - L (\frac{di}{dt}) \Rightarrow 8 = - L \times (- \frac{2}{0 .05}) \Rightarrow L = 0 .2 H$

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