A small circular loop of radius $r$ is placed inside a circular loop of radius $R (R \gg r)$. The lo

Question

A small circular loop of radius $r$ is placed inside a circular loop of radius $R (R \gg r)$. The loops are coplanar and their centers coincide. The mutual inductance of the system is proportional to

Professor PC Thomas Classes · Answer

The mutual inductance between the loops is proportional to $r^2/R$. Induced emf depends on the changing magnetic flux.