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A circular coil has moment of interia 0.8kg m² around any diameter and is carrying current to produce a magnetic moment of 20 Am². The coil is kept initially in a vertical position and it can rotate freely around horizontal diameter. When a uniform magnetic field of 4T is applied along the vertical, it starts rotating around its horizontal diameter. The angular speed the coil acquires after rotating by $60^{\circ}$ will be:
Option: 1 10 rad s^-1
Option: 2 10 $\pi$ rad s^-1
Option: 3 20 $\pi$ rad s^-1
Option: 4 20 rad s^-1

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