Question

A loop carrying a current $I$ clockwise is placed in $x-y$ plane, in a uniform magnetic field directed along $z$-axis. The tendency of the loop will be to:

• A. move along $x$-axis
• B. move along $y$-axis
• C. shrink
• D. expand

Hint:

For a current-carrying loop in a uniform magnetic field, consider the forces and torques acting on each segment. The tendency of a loop in such a field is to shrink due to the inward forces generated by the magnetic interaction.

Answer 1

The Correct Option is C

The magnetic field exerts a force on each segment of the current-carrying loop. Due to the interaction between the magnetic field and the current, the magnetic forces tend to pull the loop inward, reducing its area. This tendency to shrink can be explained by the Lorentz force acting on the current elements, which generates a net torque compressing the loop. Thus, the loop tends to: \[ \boxed{\text{shrink}}. \]