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  4. If a current of 5 A in a coil of self inductance 2 mH is cut-off in time 0.1 s, the induced emf in the coil is

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Q. If a current of $5\,A $ in a coil of self inductance $ 2\,mH $ is cut-off in time $ 0.1\,s, $ the induced emf in the coil is

J & K CETJ & K CET 2010Electromagnetic Induction

Solution:

Induced emf $e=L \frac{d i}{d t}=2 \times 10^{-3} \times \frac{5}{0.1}$
$=0.1\, V$