A circular coil of 50 turns and a radius of 10 cm carrying a current of 5.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 90° with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning?
1
3.13 Nm
2
7.85 Nm
3
2.83 Nm
4
6.32 Nm