Question

A bar magnet of magnetic moment M is aligned parallel to the direction of a uniform field B. What is the work done to turn the magnet, so as to align its magnetic moment (i) Opposite to the field direction. (ii) Normal to the field direction.

Answer 1

Explanation:

Work done in turning a dipole from orientation <br>

to

is given by <br>

<br> (i) In aligning

opposite to magnetic field, <br>

,

<br>

<br>

<br> (ii) In aligning

perpendicular to magnetic field,

,

<br>