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 ................ $V$

  • A

    $1.38$

  • B

    $1.68$

  • C

    $2.04$

  • D

    $3.10$

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