is
placed in a uniform magnetic field of 0.15T. If the bar is free to rotate in
the plane of the field, which orientation would correspond to its (a) stable,
and (b) unstable equilibrium? What is the potential energy of the magnet in
each case?
Answer:
Potential energy 
(a) If
,
Potential energy 
(
is parallel
to
)
= 0.048J
The dipole will be in stable equilibrium.
(b) If 
Potential energy 
(is
anti-parallel to)
The dipole will be unstable equilibrium.
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