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Under what situation a magnet suspended ...

Under what situation a magnet suspended in a uniform magnetic field will be (a) in stable equilibrium and (b) in unstable equilibrium?

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When axis of the magnet of magnetic moment M makes an angle `theta` with the direction of magnetic field B, then torque on magnet is
`tau=MB sin theta`
and its PE, `U=-MB cos theta`.
(a) The magnet will be in stable equilibrium if `tau=0` and U is minimum. It will be so if the magnetic moment of magnet acts in the direction of magentic field, i.e., `theta=0^@`.
(b) The magnet will be in unstable equilibrium if `tau=0` and U is maximum. It will be so if the magnetic moment of magnet acts in opposite direction to that of magnetic field.
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