A wire length $2\,m$ carrying a current of $1\,A$ is bent to form a circle. The magnetic moment of the coil is
  • A$2\,\pi \,A\, - {m^2}$
  • B$1\,/\pi \,A\, - {m^2}$
  • C$\pi \,A\, - {m^2}$
  • D$2\,/\pi \,A\, - {m^2}$
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