An $e.m.f.$ of $100$ $millivolts$ is induced in a coil when the current in another nearby coil becomes $10$ $ampere$ from zero in $0.1$ $second.$ The coefficient of mutual induction between the two coils will be....$millihenry$

  • A

    $1$ 

  • B

    $10 $ 

  • C

    $100$

  • D

    $1000$

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