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Homework Help: How do you find electric field given only time and distance?

  1. Mar 13, 2016 #1
    1. The problem statement, all variables and given/known data
    Two charged plates are 2mm apart. An electron escapes from the negatively charged plate and reaches the positively charged plates in 1.2x10^-8 seconds. Find the electric field between the plates.

    2. Relevant equations
    eV= + or - 1.6x10^-19 C

    3. The attempt at a solution
    The only way I could think of doing this is below but I'm not confident in my answer whatsoever.
    (unsure how to find velocity, too, given the numbers in the problem)
    V= (1.60x10^-19C )x(1.2x10^-8s)
    V= 1.92x10^-27

    E= (1.92x10^-27)x(0.002m)
    E= 3.84x10^-30 N/C
  2. jcsd
  3. Mar 13, 2016 #2


    User Avatar

    Staff: Mentor

    Can you explain the steps in your attempt? What equation did you employ to calculate V? How do the units work?

    When you calculate E, what equation are you using? You appear to be multiplying a voltage by a distance ???
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