A square loop of side $2\, a ,$ and carrying current I, is kept in $XZ$ plane with its centre at origin. A long wire carrying the same current $I$ is placed parallel to the $z-$axis and passing through the point $(0, b, 0),(b>>a)$. The magnitude of the torque on the loop about $z-$axis is given by:
JEE MAIN 2020, Diffcult
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$\overrightarrow{\tau}=\overrightarrow{ M } \times \overrightarrow{ B }$
$=4 a ^{2} I \times \frac{\mu_{0} I }{2 \pi b }$
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