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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$ :

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

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Ans : (1)
$ \large\frac{\pi}{4}$
answered Feb 27, 2014 by thanvigandhi_1

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