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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