A small square loop of wire of side $l$ is placed inside a large square loop of wire of side $(L > l)$. The loop are coplanar and their centre coincide. The mutual inductance of the system is proportional to

  • [IIT 1998]
  • A

    $l / L$

  • B

    ${l^2}/L$

  • C

    $L/l$

  • D

    ${L^2}/l$

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