AIPMT MAINS2011Physics-Magnetism
AIPMT MAINS 2011 Physics Magnetic Potential Energy MCQ Question
Type: MCQ-numerical-Medium-Class 12
A short bar magnet of magnetic moment 0.4 JT⁻¹ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
A
-0.082 J
B
0.064 J
C
-0.064 J
D
Zero
Correct Answer
Option C
Detailed Explanation
Potential energy U = -μB cosθ. For stable equilibrium, θ = 0°, so U = -0.064 J.
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