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  4. A current carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III and IV, arrange them in the decreasing order of potential energy

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Q. A current carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III and IV, arrange them in the decreasing order of potential energyPhysics Question Image

IIT JEEIIT JEE 2003Moving Charges and Magnetism

Solution:

U = - MB = -$ Mcos \theta $
Here, M = magnetic moment of the loop 9 = angle between M and B
U is maximum when $\theta $ = 180$^{\circ}$ and minimum when $\theta $ = 0$^{\circ}$.
So, as $\theta $ decreases from 180$^{\circ}$ to 0$^{\circ}$ its PE also decreases.