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Inductors in Circuits

A coil has se...

Question

A coil has self inductance of $0.01 H$ . The current through it is allowed to change at the rate of $1 A$ in $10^{- 2}$ s. The induced emf is

1 V

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2 V

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3 V

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4 V

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Solution

The correct option is B $1 V$
$e m f = L \frac{d i}{d t}$
$= L \frac{△ i}{△ t}$
$= 0.01 \frac{1}{10^{- 2}}$
$= 1 V$

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