Question

An infinitely 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

• A. The rod $CD$ will move upwards 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 1

Answer: (C)

The rod $CD$ will move upward and turn clockwise at the same time

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.

Correct option $\left(c\right)$. The rod CD will move upward and turn clockwise at the same time