Four wires, each of length $2.0\,m$, are bent into four loops $P,\,Q,\,R$ and $S$ and then suspended in a uniform magnetic field. If the same current is passed in each, then the torque will be maximum on the loop
AIIMS 2012, Easy
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For a given perimeter the area of circle is maximum. So magnetic moment of $(S)$ is greatest.
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