Two circular coils of radii $r_1$ and $r_2$ $(r_1 \ll r_2)$ are placed coaxially with their centers coinciding. The mutual inductance of the arrangement is
- A$\frac{\mu_0 \pi r_2^2}{2 r_1}$
- B$\frac{\mu_0 \pi r_1 r_2}{2(r_1+r_2)}$
- C$\frac{\mu_0 \pi r_1^2}{2 r_2}$
- D$\frac{\mu_0 \pi(r_1+r_2)}{2 r_1 r_2}$
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