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Two conducting loops of radi \( R_{1} \) and \( R_{2} \) are
\( \mathrm{P} \) concentric and are placed in the same plane. If

W \( R_{1}R_{2} \), the mutual inductance \( M \) between them will be directly proportional to :-
(1) \( \mathrm{R}_{1} / \mathrm{R}_{2} \)
(2) \( \mathrm{R}_{2} / \mathrm{R}_{1} \)
(3) \( \mathrm{R}_{1}^{2} / \mathrm{R}_{2}^{2} \)
(4) \( \mathrm{R}_{2}^{2} / \mathrm{R}_{1} \)
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