Two wires of same length are bent to form a circular loop with two turns and a square loop of one turn. Both of them carry the same current. The ratio of the magnetic moment of the circular loop of two turns to that of the square loop is

  • A
    $\pi : 4$
  • B
    $4 : \pi$
  • C
    $\pi : 1$
  • D
    $2 : \pi$

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