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  4. A rectangular loop of wire, supporting a mass m, hangs with one end in a uniform magnetic field vecB pointing out of the plane of the paper. A clockwise current is set up such that i > mg/Ba, where a is the width of the loop. Then :

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Q. A rectangular loop of wire, supporting a mass $m$, hangs with one end in a uniform magnetic field $\vec{B}$ pointing out of the plane of the paper. A clockwise current is set up such that $i > mg/Ba$, where $a$ is the width of the loop. Then :Physics Question Image

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Solution:

Correct answer is (c) The weight rises due to a vertical force caused by the magnetic field but no work is done on the system