Physics-
General
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Question

An electron in the ground state of hydrogen atom is revolving in anticlockwise direction in the circular orbit of radius R The atom is placed in a uniform magnetic induction B such that the plane normal of electron orbit makes an angle 300 with B, as shown in figure The torque experienced by electron will be

  1. fraction numerator e h B over denominator 8 pi m end fraction    
  2. fraction numerator e h over denominator 8 pi B m end fraction    
  3. fraction numerator e B over denominator 8 pi m h end fraction    
  4. fraction numerator h B over denominator 8 pi e m end fraction    

The correct answer is: fraction numerator e h B over denominator 8 pi m end fraction

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