If the current $30 \,A$ flowing in the primary coil is made zero in $0.1 \,sec$. The $e.m.f.$ induced in the secondary coil is $1.5 \,volt$. The mutual inductance between the coil is.....$H$

  • A

    $0.05 $

  • B

    $1.05$

  • C

    $0.1$

  • D

    $0.2$

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