First slide

Inductance

Question

The current in a coil decreases from 1 A to 0.2 A in 10 s. Calculate the coefficient of self-inductance, if induced emf is 0.4 volt.

Easy

A

5 H
B

3 H
C

4 H
D

2 H

Solution

$e = - L \frac{di}{dt} \Rightarrow 0.4 = - \frac{L (0.2 - 1)}{10} \Rightarrow L = 5 H$

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