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Electric field strength and speed

  1. Feb 7, 2008 #1
    The electric field strength is 1.70×104 inside a parallel-plate capacitor with a 1.40 spacing. An electron is released from rest at the negative plate.

    What is the electron's speed when it reaches the positive plate?
    Help please...
  2. jcsd
  3. Feb 9, 2008 #2
    You need to combine Forces with Kinematics. We know that F = KE/r and also know that [tex](v_{f})^2 = (v_{i})^2 + 2ad[/tex] and of course, newton's second law: F = ma. You have everything you need, just use some basic algebra, and that's it.
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