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Class 12 NEET Physics Magnetism and Matter Questions
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© examsnet.com
Question : 29
Total: 50
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
(2011 Mains)
0.064 J
-0.064 J
zero
-0.082 J
Validate
Solution:
Here, Magnetic moment,
M
=
0.4
J
T
−
1
Magnetic field,
B
=
0.16
T
When a bar magnet of magnetic moment
→
M
is placed in a uniform magnetic field
→
B
,its potential energy is
U
=
−
→
M
⋅
→
B
=
−
M
B
c
o
s
θ
For stable equilibrium,
θ
=
0
°
∴
U
=
−
M
B
=
−
(
0.4
J
T
−
1
)
(
0.6
T
)
=
−
0.064
J
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