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Question: Answered & Verified by Expert
A long thin magnet of magnetic moment M is bent into a semi-circle. The decrease in the magnetic moment is
PhysicsMagnetic Properties of MatterJEE Main
Options:
  • A 2Mπ
  • B πM2
  • C Mπ-2π
  • D M2-π2
Solution:
2939 Upvotes Verified Answer
The correct answer is: Mπ-2π
Magnetic length is the minimum distance between the north pole and the south pole, which is decreased in the second case.

M=2Mπ, decrease in magnetic moment

=M-2Mπ

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