Question

A magnetic needle is kept in a non uniform magnetic field . It experiences
A. a force and a torque
B. a force but not a torque
C. A torque but not a force
D. neither a force nor a torque

Answer 1

Correct Answer - A
The force on north pole ` = mvec(B)_(1)`
The force on south pole `= m vec(B)_(2)`
Since the forces will be unequal and are not having same line of action therefore, the magnetic needle experiences a force as well as a torque.