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AP EAMCET2008PhysicsMagnetic Effects of Current

The magnetised wire of moment M and length l is bent in the form of semicircle of radius r . Then its magnetic moment is

Options

  1. A2 M
  2. B2 M
  3. CM
  4. Dzero

Correct answer

A. 2 M

Step-by-step solution

On bending a wire its pole strength remains unchanged whereas its magnetic moment changes. New magnetic moment, M^ =m(2 r)=m ( 2 l )= 3 M

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