A small square loop of wire of side $l$ is placed inside a large square loop of wire $L(L \gg l)$. Both loops are coplanar and their centres coincide at point $O$ as shown in figure. The mutual inductance of the system is.

208526-q

  • [JEE MAIN 2022]
  • A

    $\frac{2 \sqrt{2} \mu_{0} L ^{2}}{\pi \ell}$

  • B

    $\frac{\mu_{0} \ell^{2}}{2 \sqrt{2 \pi L}}$

  • C

    $\frac{2 \sqrt{2} \mu_{0} \ell^{2}}{\pi L }$

  • D

    $\frac{\mu_{0} L ^{2}}{2 \sqrt{2} \pi \ell}$

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