If the coefficient of mutual induction of the primary and secondary coils of an induction coil is $5\, H$ and a current of $10\, A$ is cut off in $5\times10^{-4}\, s$, the $emf$ inducted (in $volt$) in the secondary coil is

  • A

    $5\times10^4$

  • B

    $1\times10^5$

  • C

    $25\times10^5$

  • D

    $5\times10^6$

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