An infinitely long, straight conductor `AB` is fixed and a current is passed through it. Another movable straight wire `CD` of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire

Options

A. The rod `CD` will move upward parallel to itself
B. The rod `CD` will move downward parallel to itself
C. The rod `CD` will move upward and turn clockwise at the same time
D. The rod `CD` will move upward and turn anticlockwise at the same time

Answer

C

Explanation

since the force on the rod `CD` is non-uniform it will experience force and torque. From the left hand side it can be seen that the force will be upward and torque is clockwise