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Self Induction

The rate of c...

Question

The rate of change of current needed to induce an emf of $8 V$ in $0.1 H$ coil is

A

0.8 A / s

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B

0.125 A / s

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C

80 A / s

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D

8 A / s

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Solution

The correct option is C $80 A / s$
$e m f = L \frac{d i}{d t}$

$\frac{d i}{d t} = \frac{e m f}{L}$

$= \frac{8}{0.1}$

$= 80 A / s$

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