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 induces a force on each part of the current-carrying loop. This magnetic force, resulting from the interaction between the field and the current, pulls the loop inwards, decreasing its size. The Lorentz force acting on the current elements explains this contraction, as it creates a net torque that compresses the loop. Therefore, the loop tends to: \[ \boxed{\text{shrink}}. \]