A wire of length 6.28 m is bent into a circular coils of 2 turns. If a current of 0.5 A exists in the coil, the magnetic moment of the coil is, in $A-M^2$ :

Question

$\begin {array} {1 1} (1)\;\large\frac{\pi}{4} & \quad (2)\;\large\frac{1}{4} \\ (3)\;\pi & \quad (4)\;4\pi \end {array}$