For driving a current of $2\, A$ for $6$ minutes in a circuit, $1000\, J$ of work is to be done. The $e.m.f.$ of the source in the circuit is ................ $V$
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(a) $P = \frac{W}{t} = Vi$ $ \Rightarrow $ $V = \frac{W}{{it}} = \frac{{1000}}{{2 \times 6 \times 60}} = 1.38\,V$
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