Q. A circular coil of radius $10 \,cm$ with $100$ turns carrying a current of $0.5$ A lies in a magnetic field of $2 T$ such that the normal drawn to the plane of the coil makes an angles $\theta$ with the direction of the field. Work done in rotating the coil to change the angle $\theta$ from $0^{\circ}$ to $180^{\circ}$ is
AP EAMCETAP EAMCET 2019
Solution: