Question

If a bar magnet is kept perpendicular in a magnetic field of unit magnetic induction then its magnetic moment is equal to:

• A. magnetic flux
• B. torque
• C. pole strength
• D. magnetic flux density

Answer 1

Answer: (B)

torque

From the given question,

$B=1T$

$\theta ={90}^0$

The torque acting on the bar magnet is given by

$\tau =MBsin\theta =M\times 1\times sin{90}^0$

$\tau =M$

The magnetic moment is equal to the torque.

The correct option is B.