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A straight wire is first bent into a circle of radius 'r' and then into squ

A straight wire is first bent into a circle of radius 'r' and then into square of side 'x' each of one turn.if the currents flowing through them are in the ratio 4:5,then the ratio of their effective magnetic moments 1)π/8. 2)12/5π. 3)16/5π. 4)8/5π

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