A) \[\overset{\to }{\mathop{M}}\,\times \overset{\to }{\mathop{B}}\,\]
B) \[\overset{\to }{\mathop{M}}\,-\overset{\to }{\mathop{B}}\,\]
C) \[\frac{1}{2}\overset{\to }{\mathop{M}}\,\times \overset{\to }{\mathop{B}}\,\]
D) \[\overset{\to }{\mathop{M}}\,+\overset{\to }{\mathop{B}}\,\]
Correct Answer: A
Solution :
Torque acting on the magnet is given by \[\overrightarrow{\tau }=\overset{\to }{\mathop{M}}\,\times \overset{\to }{\mathop{B}}\,\] Here,\[\overset{\to }{\mathop{M}}\,=\]magnetic moment, \[\overset{\to }{\mathop{B}}\,=\]magnetic field.
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