$A$ small coil of radius $r$ is placed at the centre of $a$ large coil of radius $R,$ where $R > > r$. The coils are coplanar. The coefficient of mutual inductance between the coils is
$A$ small coil of radius $r$ is placed at the centre of $a$ large coil of radius $R,$ where $R > > r$. The coils are coplanar. The coefficient of mutual inductance between the coils is
- A
$\frac{{{\mu _0}\pi r}}{{2R}}$
- B
$\frac{{{\mu _0}\pi {r^2}}}{{2R}}$
- C
$\frac{{{\mu _0}\pi {r^2}}}{{2{R^2}}}$
- D
$\frac{{{\mu _0}\pi r}}{{2{R^2}}}$
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