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  4. An average induced e.m.f. of 1 V appears in a coil when the current in it is changed from 10 A in one direction to 10 A in opposite direction in 0.5 s. Self-inductance of the coil is

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Q. An average induced e.m.f. of $1\, V$ appears in a coil when the current in it is changed from $10\, A$ in one direction to $10\, A$ in opposite direction in $0.5\, s$. Self-inductance of the coil is

Electromagnetic Induction

Solution:

$|e|=L \frac{d i}{d t} \Rightarrow 1=\frac{L \times\{10-(-10)\}}{0.5}$
$\Rightarrow L=25\, mH$