$A$ current $i$ is flowing in a conductor of length $l$. When it is bent in the form of a circular loop,then its magnetic moment will be-

  • A
    $\frac{l^2i}{4 \pi}$
  • B
    $\frac{l^2}{4 \pi}$
  • C
    $\frac{4 \pi}{l^2i}$
  • D
    $4 \pi l^2i$

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