Question

A circular coil consisting of a single loop of wire has a radius of 27.1 cm and carries a current of 26.7 A. It is placed in an external magnetic field of 0.331 T. Calculate the torque on the wire when the plane of the coil makes an angle of 43.9° with the direction of the field .

Answer 1

Then Torque is

= BIA cos theta

Here A = pi r^2