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Homework Help: Cathode Ray Tube in a uniform magnetic field

  1. Oct 11, 2009 #1
    1. The problem statement, all variables and given/known data

    A CRT is placed in a uniform magnetic field B, with the axis of the tube parallel to the lines of force. If electrons emerging from the gun with a velocity v make an angle θ as they pass through the origin O so that their trajectory is a helix, show that a) they will touch the axis again at the time t= 2πm/Bq
    b) that the coordinate of the point of touching is x= 2π(mv/Bq) (cosθ)

    2. Relevant equations
    t= 2πm/Bq
    x= 2π(mv/Bq) (cosθ)

    3. The attempt at a solution
  2. jcsd
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