A circular coil having 200 turns , 2.5 × 10 ^-4 m^2 area and carrying 100 microA current is placed

A circular coil having 200 turns , 2.5 × 10 ^-4 m^2 area and carrying 100 microA current is placed in a uniform magnetic field of 1 T . Initially the magnetic dipole moment M wad directed along B . Amount of work ,required to rotate the coil through 90° from the initial orientation such that M becomes perpendicular to B is ...... micro joule .
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