Physics-Bar Magnet
NEET Physics Bar Magnet MCQ Question
Type: MCQ-numerical-Medium-Class 12
A bar magnet with a magnetic moment of 0.40 A m² is placed in a uniform magnetic field of 800 G. If the magnet is initially aligned parallel to the field, what is the potential energy of the magnet in this configuration?
A
0 J
B
-0.32 J
C
0.32 J
D
-0.16 J
Correct Answer
Option B
Detailed Explanation
Using the formula for potential energy, U = -m.B, where m = 0.40 A m² and B = 800 G = 0.08 T (since 1 G = 10⁻⁴ T). Therefore, U = -0.40 * 0.08 = -0.32 J.
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