MagnetismHard
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
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 JCreate a free account to view solution
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