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 will be:
Option: 1 10 rad s-1
Option: 2 10 rad s-1
Option: 3 20 rad s-1
Option: 4 20 rad s-1