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The magnitude of magnetic moment of a rectangular loop \( A B C D \) (Fig 1) carrying a current i is \( M \). \( E F \) is the perpendicular bisector of side \( A B \) and DC. If the loop is folded about EF (Fig 2) to convert it into two mutually perpendicular planes \( A F E D \) and ECBF, then the magnitude of new magnetic moment will be
(1) \( M \)
(3) \( \frac{M}{\sqrt{2}} \)
(2) \( \frac{M}{2} \)
(4) \( \sqrt{2} \mathrm{M} \)
\( \mathrm{P} \)
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