A short bar magnet of magnetic moment 0.4J T^-1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is(a) –0.064 J(b) zero(c) –0.082 J(d) 0.064 J
For stable equilibrium
U = -MB
= – (0.4)(0.16)
= – 0.064 J
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