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A coil N turns and radius "R" carries a current i it is unwound and rewound to make a square coil of side "α" having

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A coil N turns and radius "R"  carries a current i it is unwound and rewound to make a square coil of side "α" having same number of turns (N) keeping the current I same find the ratio of the magnetic moments of the square coil and the circular coil.

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A1 = πR2

M1 = NlA1

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