Physics · 2013
JEE Main · 23 April 2013, Shift 1 · Q11
A rectangular loop of wire, supporting a mass m, hangs with one end in a uniform magnetic field B pointing out of the plane of the paper. A clockwise…
A rectangular loop of wire, supporting a mass m, hangs with one end in a uniform
magnetic field $\displaystyle \vec{B}$ pointing out of the plane of the paper. A clockwise current is set up such that $\displaystyle \mathrm{i}>\mathrm{mg} / \mathrm{Ba}$, where a is the width of the loop. Then :
Official answer
(2)
The magnetic field causes force with both a vertical and a horizontal component. Work has to be done by an external agent to maintain current.
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.