Question

A magnetic field is produced and directed along y-axis. A magnet is placed along x-axis .The direction of the torque on the magnet is:

• A. in the x-y plane
• B. along z-axis
• C. along y-axis
• D. torque will be zero

Answer 1

The correct option is B along z-axis

$\tau =\overrightarrow{M}\times \overrightarrow{B}$
$\hat{i}\times \hat{j}=\hat{k}$
The direction of torque will be always $Z-axis(+ve)$