Two concentric circular coils, one of small radius \(\mathrm{r_1}\) and the other of large radius \(\mathrm{r_2},\) such that \(\mathrm{r_1<<r_2},\)  are placed co-axially with centres coinciding. The mutual inductance of the arrangement is:
1. \(\frac{\mu_0\pi r_1^2}{3r_2}\)

2. \(\frac{2\mu_0\pi r_1^2}{r_2}\)
3. \(\frac{\mu_0\pi r_1^2}{r_2}\)
4. \(\frac{\mu_0\pi r_1^2}{2r_2}\)

Subtopic:  Mutual Inductance |
 67%
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