General Science - Physics MCQs

Q.  What happens to a bar magnet of dipole moment (m) is placed in a uniform magnetic field (B)?

a. the force on the bar magnet is zero
b. the torque on the bar magnet is m × B
c. Both a and b
d. None of the above


ANSWER: See Answer
 
When a bar magnet of dipole moment m is placed in a uniform magnetic field B: (a) the force on it is zero, (b) the torque on it is m × B, (c) its potential energy is –m.B, where we choose the zero of energy at the orientation when m is perpendicular to B.
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