Question

A magnetic needle is kept in a non-uniform magnetic field. It experiences:

• A. neither a force nor a torque
• B. a torque but not a force
• C. a force but not a torque
• D. a force and a torque

Hint:

In a non-uniform magnetic field, the imbalance in forces on the poles of a magnetic dipole generates both a net force and a torque. The torque aligns the dipole with the field lines.

Answer 1

The Correct Option is D

When a magnetic needle is placed in a non-uniform magnetic field, it experiences both a net force and a torque.
The non-uniform magnetic field applies forces of different magnitudes on the north and south poles of the needle, causing an imbalance.
This imbalance results in a net force acting on the needle.
Simultaneously, these unequal forces produce a torque that aligns the needle along the magnetic field lines.
Final Answer: \[ \boxed{\text{a force and a torque}} \]