A bar magnet may be treated as a magnetic dipole of moment

PHYSICS · Multi-part · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

0.50\,\text{A\,m}^2

. It is placed in a uniform magnetic field of magnitude

0.20\,\text{T}

. (i) Calculate the work that must be done to rotate the dipole from an initial orientation

\theta_1 = 180^{\circ}

to a final orientation

\theta_2 = 0^{\circ}

with respect to the field. (ii) The same magnet is now released from rest when its axis makes an angle of

60^{\circ}

with the field. Find the kinetic energy gained by the magnet when it reaches the position

\theta = 0^{\circ}