Permanent magnetismMedium

Question

A short bar magnet of magnetic moment 0.4 JT-1 is placed in a formula in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is 

Options

A.0.064 J
B.- 0.064 J
C.zero
D.- 0.082 J

Solution

Here, magnetic moment, M = 0.4 JT-1
    Magnetic field, B = 0.16 T
When a bar magnet of a magnetic maoment is placed in a uniform magnetic field , its potential energy is
      U = - = MB cos θ
Foer statble equilibrium, θ = 0o
∴ U = - = - (0.4JT-1)(0.6T) cos 0o = - 0.064 J

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