In series with \( 20 \mathrm{ohm} \) resistor a 5 henry inductor is...

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In series with \( 20 \mathrm{ohm} \) resistor a 5 henry inductor is
\( \mathrm{P} \) placed. To the combination an e.m.f. of 5 volt is

W applied. What will be the rate of increase of current at \( t=0.25 \mathrm{sec} \) ?
(1) \( e \)
(2) \( e^{-2} \)
(3) \( e^{-1} \)
(4) None of these
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