1.

A straight wire carrying current i is turned into a circular loop. If the magnitude of magnetic moment associated with it in M.K.S. unit is M, the length of wire will be [MP PET 1999]

A.            \[4\pi iM\]                            
B.            \[\sqrt{\frac{4\pi M}{i}}\]
C.            \[\sqrt{\frac{4\pi i}{M}}\]      
D.            \[\frac{M\pi }{4i}\]
Answer» C.            \[\sqrt{\frac{4\pi i}{M}}\]      


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