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Homework Help: Electron between two plates

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data
    An electron is projected with an initial speed v_0 = 2.00×106 {\rm m/s} into the uniform field between the parallel plates in the figure (Intro 1 figure) . Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the field at a point midway between the plates.
    If the electron just misses the upper plate as it emerges from the field, find the magnitude of the electric field.
    (length of plates = 2cm, distance between plates=1cm)

    2. Relevant equations

    3. The attempt at a solution
    Ok, so first I tried to force on the charge from the electric field, but I dont know the electric field. So then I tried the position equation to find Acceleration but I dont know the time it took to travel through the plates, I would be able to find that but im not sure if the velocity in the x direction stays the same? (the direction parallel to the plates)
  2. jcsd
  3. Sep 19, 2009 #2


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    Homework Helper

    As you have said, the velocity in the x direction remains the same.
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