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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 $i>m g / B a$, where $a$ is the width of the loop. Then :

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The weight rises due to a vertical force caused by the magnetic field but no work is done on the system.
The weight rises due to a vertical force caused by the magnetic field but no work is done on the system.
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