1.

A current i flows in a circular coil of radius r. If the coil is placed in a uniform magnetic field B with its plane parallel to the field, magnitude of the torque that acts on the coil is  [MP PET 2001]

A.            Zero                                         
B.            \[2\pi \,r\,i\,B\]
C.            \[\pi \,{{r}^{2}}\,i\,B\]      
D.            \[2\pi \,{{r}^{2}}\,i\,B\]
Answer» D.            \[2\pi \,{{r}^{2}}\,i\,B\]


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