A loop carrying current $I$ lies in the $x$-y plane as shown in the figure. the unit vector $\hat{ k }$ is coming out of the plane of the paper. the magnetic moment of the current loop is :
  • A$a^2 I \hat{k}$
  • B$\left(\frac{\pi}{2}+1\right) a^2 I \hat{k}$
  • C$-\left(\frac{\pi}{2}+1\right) a^2 I \hat{k}$
  • D$(2 \pi+1) a^2 I \hat{k}$
IIT 2012, Advanced
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