A coil having 100 turns, area of $5 \times 10^{-3} \mathrm{~m}^2$, carrying current of 1 mA is placed in uniform magnetic field of 0.20 T such a way that plane of coil is perpendicular to the magnetic field. The work done in turning the coil through $90^{\circ}$ is $\_\_\_\_$ $\mu \mathrm{J}$.
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