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A particle of mass m and charge q, moving with velocity V enters Region II normal to the boundary as shown in fig Region II has a uniform magnetic field B perpendicular to the plane of the paper The length of the Region II is l Then

  1. The particle enters Region III only if its velocity V greater than fraction numerator q l B over denominator m end fraction    
  2. Path length of the particle in region II is maximum when velocity V equals fraction numerator q l B over denominator m end fraction    
  3. Time spent in Region II is same for any velocity V as long as the particle returns to Region I    
  4. All the above are correct    

The correct answer is: All the above are correct

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