A coil of radius $1\, cm$ and of turns $100$ is placed in the middle of a long solenoid of  radius $5\, cm$. and having $5\, turns/cm$. parallel to the axis of solenoid The mutual  inductance in millihenery will be

  • A

    $0.0316$

  • B

    $0.063$

  • C

    $0.105$

  • D

    $0$

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