Two circuits have coefficient of mutual induction of $0.09$ $henry$. Average $e.m.f$. induced in the secondary by a change of current from $0$ to $20$ $ampere$ in $0.006$ $second$ in the primary will be......$V$

  • A

    $120$

  • B

    $80$

  • C

    $200$

  • D

    $300$

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