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  4. The self-induced e.m.f. in a 0.1 H coil when the current in it is changing at the rate of 200 A / s is

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Q. The self-induced e.m.f. in a $0.1\, H$ coil when the current in it is changing at the rate of $200\, A / s$ is

Electromagnetic Induction

Solution:

$|e|=L \frac{d i}{d t} \Rightarrow |e|=0.1 \times 200=20\, V$