A wire of length $L$ metre carrying a current of $I$ ampere is bent in the form of circle. Its magnetic moment is
NEET 2020, Medium
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Length of wire, $L =2 \pi R$
Radius of loop, $R=\frac{L}{2 \pi}$
Magnetic moment, $M =I A$
$=I\left(\frac{\pi L^{2}}{4 \pi^{2}}\right)$
$=\frac{I L^{2}}{4 \pi} A \;m^{2}$
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