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MHT CET20239 May 2023Evening ShiftPhysicsMagnetic Effects of CurrentActual

A thin rod of length L has magnetic moment M when magnetised. If rod is bent in a semicircular arc what is magnetic moment in new shape?

Options

  1. AM L
  2. BM
  3. CM 2
  4. D2 M

Correct answer

D. 2 M

Step-by-step solution

Magnetic moment of rod = M Let r be the radius after bending it into a semicircular arc. The separation between the two ends is 2 r. Here length = circumference of the semicircle i.e., L = r r= L Also M = m L and m = M L aligned M _ new = m (2 r ) & = M L 2 ~L & = 2 M aligned

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