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Two conducting loops of radii R1 and R2 ...

Two conducting loops of radii `R_1` and `R_2` are concentric and are placed in the same plane. If `R_1`>`R_2`, then mutual inductance M between them will be directly proportional to :
(1) `R_1`/`R_2`
(2) `R_2`/`R_1`
(3) `R_1^2`/`R_2^2`
(4) `R_2^2`/`R_1`

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