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>>Dipole in a Uniform Magnetic Field
>> $A short bar magnet of magnetic moment 0.$

Question

A short bar magnet of magnetic moment $0.4 J T^{1}$ 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

-0.064 J

C

zero

D

0.082 J

Medium

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Updated on : 2022-09-05

Solution

Verified by Toppr

Correct option is B)

Potential energy of a magnet with magnetic moment $M$ placed in a magnetic field $B$ is given by
$U = - M . v e c B$
$= - M B c o s θ$
which is smallest for $θ = 0$
Hence $U_{m i n} = - M B = - 0.4 \times 0.16 J$
$= - 0.064 J$

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