1.

The radius of a circular loop is r and a current i  is flowing in it. The equivalent magnetic moment will be [CPMT 1990]

A.            ir    
B.            \[2\pi ir\]
C.            \[i\pi {{r}^{2}}\]                  
D.            \[\frac{1}{{{r}^{2}}}\]
Answer» D.            \[\frac{1}{{{r}^{2}}}\]


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