1.

A short bar magnet of magnetic moment m = 0.32 JT-1 is placed in a uniform external magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientations would correspond to itsstable andunstable equilibrium? What is the potential energy of the magnet in each case?

Answer»

Given M = 0.32 JT-1 B = 0.15 T, U = ?

  • If \(\overrightarrow M||\overrightarrow B\) then we have stable equilibrium and U = -MB = -0.32 × 0.15 T = -4.8 × 10-2J
  • If is \(\overrightarrow M\) anti-parallel to \(\overrightarrow B\) we have unstable equilibrium and

U = MB = 0.32 × 0.15 J = 4.8 × 10-2 J


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