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  4. The current through choke coil increases from zero to 6 A in 0.3 seconds and an induced e.m.f. of 30 V is produced. The inductance of the coil of choke is

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Q. The current through choke coil increases from zero to $6\, A$ in $0.3$ seconds and an induced e.m.f. of $30\, V$ is produced. The inductance of the coil of choke is

Electromagnetic Induction

Solution:

$|e|=L \frac{d i}{d t} \Rightarrow 30=L \times \frac{(6-0)}{0.3}$
$\Rightarrow L=1.5\, H$