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Two conducting circular loops of radii \( R_{1} \) and \( R_{2} \) are placed in the same plane with their centres
\( \mathrm{P} \) coinciding. If \( R_{1}R_{2} \), the mutual inductance \( M \)

W between them will be directly proportional to
(a) \( \frac{R_{1}}{R_{2}} \)
(b) \( \frac{R_{2}}{R_{1}} \)
(c) \( \frac{R_{1}^{2}}{R_{2}} \)
(d) \( \frac{R_{2}^{2}}{R_{1}} \)
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