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Homework Help: Moving Proton in an Electric Field problem

  1. Jun 29, 2008 #1
    1. The problem statement, all variables and given/known data

    Moving Proton in an Electric Field
    A proton with kinetic energy of 2.95 × 106 eV is fired perpendicular to the face of a large plate that has a uniform charge density of σ = +7.50 μC/m2. What is the magnitude of the force on the proton?

    How much work must the electric field do on the proton to bring it to rest?

    From what distance should the proton be fired so that it stops right at the surface of the plate?

    3. The attempt at a solution

    I really have no idea how to do this one. No one in my class can seem to figure this one out.
  2. jcsd
  3. Jun 29, 2008 #2


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    Homework Helper
    Gold Member

    This isn't an excuse to not show any of your own thoughts on the problem. You may not be able to show any work, but you can still think about the problem qualitatively and post your thoughts. Remember your must show independent effort on the problem in order to get help here. You can start by answering some of these questions:

    What concepts from class do you think apply to this problem?

    Will the force between the proton and the sheet be attractive or repulsive?

    Do you have any formulas for the force or the electric field of the sheet?
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