A) \[IL\]
B) \[{{I}^{2}}L\]
C) \[I{{L}^{2}}\]
D) \[I{{L}^{2}}/4\pi \]
Correct Answer: D
Solution :
: Magnetic moment of a coil\[=NIA\] \[L=2\pi R\] or \[R=\frac{L}{2\pi }\] \[\therefore \]Area\[A=\pi {{R}^{2}}=\pi {{\left( \frac{L}{2\pi } \right)}^{2}}=\frac{{{L}^{2}}}{4\pi }\] \[\therefore \]Magnetic moment\[=\frac{I{{L}^{2}}}{4\pi }\]
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