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Turns Ratio

The average s...

Question

The average self-induced emf in a $25 m H$ solenoid when the current in it falls from $0.2 A$ to $0 A$ in $0.01$ second, is

A

0.05 V

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B

0.5 V

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C

500 V

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D

50 V

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Solution

The correct option is B $0.5 V$
$e m f = L \frac{d i}{d t}$
$= 25 \times 10^{- 3} \times \frac{0.2}{0.01}$
$= 0.5 V$

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