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  4. The self-induced emf in a coil of 0.4 H self-inductance when current in it is changing at the rate of 50 As -1, is

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Q. The self-induced emf in a coil of $0.4 \,H$ self-inductance when current in it is changing at the rate of $50 \,As ^{-1}$, is

Electromagnetic Induction

Solution:

The induced emf is given by
$|e|=\left(L \frac{d i}{d t}\right)=0.4 \times 50=20\, V$