An infinite current carrying wire passes through point O and is perpendicular to the plane containing a current carrying loop ABCD as shown in figure. Choose the correct option(s).

Options

A. Net force on the loop is zero.
B. Net torque on the loop is zero.
C. As seen from O, the loop rotates clockwise.
D. As seen from O, the loop rotates anticlockwise.

Answer

A, C

Explanation

There is no force on the portion of wire AB and CD as current in them is parallel to the direction of magnetic field. The magnetic force on wire BC is perpendicular to the loop directed outwards and on wire OA, the magnetic force would be perpendicular to the loop directed inwards. Both these forces will be equal in magnitude. Therefore, the net force on the wire loop is zero and torque on the loop would be along the clockwise direction as seen from O.