A small square loop of wire of side $l$ is placed inside a large square loop of side $L \left(L\gg l\right).$ If the loops are coplanar and their centres coincide, the mutual induction of the system is directly proportional to

• A

  $\frac{l}{L}$
• Correct answer
  B

  $\frac{l^2}{L}$
• C

  $\frac{l}{L^2}$
• D

  $\frac{l^2}{L^2}$

Hence, the correct answer is option: 'B'.