A) \[1/{{r}^{2}}\]
B) \[1/r\]
C) \[r\]
D) \[{{r}^{2}}\]
Correct Answer: D
Solution :
The magnetic moment is a measure of the strength of a magnetic source. The equation for magnetic moment in the current carrying loop, carrying current I and of area vector A for which the magnitude is given by \[M=IA\] where I is current A, is area \[(=\pi {{r}^{2}})\] \[M=I\pi {{r}^{2}}\] \[\Rightarrow \] \[M\propto {{r}^{2}}\] Note: Magnetic moment and magnetic dipole moment is the same thing.
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