Moving Charges and Magnetism

Question: If m is magnetic moment and B is the magnetic field, then the torque is given by

1) $\mathop {m.B}\limits^{ \to \,\, \to } $

2) $\frac{{\mathop {|m|}\limits^ \to }}{{\mathop {|B|}\limits^ \to }}$

3) $\mathop {m \times B}\limits^{ \to \,\,\,\, \to } $

4) $\mathop {|m|.\,|B|}\limits^{ \to \,\,\,\,\,\,\,\,\,\, \to } $

Solution:

Explanation: No Explanation

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