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Faraday's Law

The current i...

Question

The current in a coil of inductance $5 H$ decreases at the rate of $2 A / s .$ The induced e.m.f. is

A

2 V

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B

5 V

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C

10 V

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D

- 10 V

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Solution

The correct option is D $10 V$
$e = - L \frac{d i}{d t},$ since current decreases so $\frac{d i}{d t}$ is negative, hence

$e = - 5 \times (- 2) = + 10 V$

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