A circular coil of 30 turns and radius is 8.0 cm carrying a current of 6.0A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0T the field lines make an angle of `60^@` with the normal to the coil calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
would your answer change if the circular coil in (a) were replaced by a planar coil of sime irregular shape that encloses the same area ?(all other particulars are alsao unaltered.)