1.

Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be                                 [Pb. PET 2004]

A.            \[\frac{Li{{B}^{2}}}{2}\]   
B.            \[\frac{L{{i}^{2}}B}{2}\]
C.            \[\frac{{{L}^{2}}iB}{4\pi }\]    
D.            \[\frac{L{{i}^{2}}B}{4\pi }\]
Answer» D.            \[\frac{L{{i}^{2}}B}{4\pi }\]


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