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An e.m.f. of 5 volt is produced by a self inductance, when the current changes at a steady rate from $3 A$ to $2 A$ in 1 millisecond. The value of self inductance is
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$5 \mathrm{mH}$
$L=\frac{e}{d i / d t}=$ $\frac{5}{3-2) / 10^{-3}}=\frac{5}{1} \times 10^{-3}=5$ milli henry
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