Two coils $X$ and $Y$ are placed in a circuit such that when a current changes $2A$ in coil $X,$ the magnetic flux changes by $0.4\,weber$ in $Y$. The value of mutual inductance of the coils....$H$

  • A

    $0.2$

  • B

    $5$

  • C

    $0.8$

  • D

    $20$

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