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Self Induction

What is the s...

Question

What is the self inductance of a coil in which an induced emf of $2 V$ is set up, when the current is changing at the rate of $4 A s^{- 1}$

A

0.5 m H

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B

0.05 H

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C

2 H

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D

0.5 H

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Solution

The correct option is C $0.5 H$
Induced emf in a inductor $L$ is: $ε = L \frac{d i}{d t} = L \times 4$
$\Rightarrow 2 = L \times 4$
$\Rightarrow L = 0.5 H$

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