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A circular coil of 100 turns and having ...

A circular coil of 100 turns and having an effective radius of `5cm` carries a current of `0*1` ampere. How much work is required to turn it in an external magnetic field of `1*5 weber//m^2` through `180^@` about an axis perpendicular to magnetic field. The plane of the coil is initially perpendicular to the magnetic field.

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