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A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make another coil of radius

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A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make another coil of radius R/2, current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.

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            For the coil of radius "R"

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