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  4. The induced emf in a coil of 10 Henry inductance in which current varies from 9 A to 4 A in 0.2,second is

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Q. The induced emf in a coil of $10$ Henry inductance in which current varies from $9\,A $ to $4\,A$ in $0.2$,second is

J & K CETJ & K CET 2013Electromagnetic Induction

Solution:

Included emf $e=-L \frac{d i}{d t}$
Given, $L=10\, H,\, \Delta i=9-4=5\, A,\, d t=0.2\, s$
$e=10 \times \frac{5}{0.2}=250\, V$