PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism
Problem
A square coil of 20 turns, side 10cm, carries a current of 2A. It is suspended in a uniform magnetic field of 0.5T such that its plane makes an angle of 30∘ with the field. Which statement best describes the resultant magnetic action on the coil?
(a) Both the net magnetic force and the net torque on the coil are zero.
(b) The net force is zero, but a torque acts that tends to rotate the coil so that its plane becomes parallel to the field.
(c) The net magnetic force on the coil is zero, but a torque acts that tends to rotate the coil so that its plane becomes perpendicular to the field.
(d) Both a net force and a torque act; the torque magnitude is NIABsin30∘.