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A circular coil of 100 turns has an effe...

A circular coil of 100 turns has an effective radius of 0.05 m and carries a current of 0.1 A. How much work is required to turn it in an external magnetic field of `1.5 Wb m^-2` through `180^@` about an axis perpendicular to the magnetic field. The plane of the coil is initially perpendicular to the magnetic field.

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