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Homework Help: Angle of deflection of electron

  1. Jan 21, 2016 #1
    1. The problem statement, all variables and given/known data
    2 parallel plates of length 4.0 cm are arranged horizontally in a vacuum. The upper plate is positively charged and the lower plate is negatively charged. An electron is projected horizontally with an initial velocity of 6.0 x 106 ms-1 and experiences a constant electric force of 3.4 x 10-17 N whilst between the plates. Negating any gravitational effects, find the angle the electron makes with the horizontal on leaving the plates.

    2. Relevant equations
    Not that I know of

    3. The attempt at a solution
    The electron experiences an attractive force of 3.4 x 10-17 N towards the positively charged plate. I don't know the horizontal component of the force acting on the electron so I can't calculate the resultant force.
  2. jcsd
  3. Jan 21, 2016 #2


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    What makes you think there is a horizontal component or force?
  4. Jan 21, 2016 #3
    you know the horizontal VELOCITY..can you calculate the time that the electron is between the plates?
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