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Q. A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field $\bar{B}$ . The work done to rotate the loop by $30^{\circ}$ about an axis perpendicular to its plane is :

Moving Charges and Magnetism

Solution:

No work is done to rotate the loop about an axis perpendicular to its plane as $\bar{M}$ rected along the axis Work is done only . when the plane of the loop rotates,.