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Homework Help: Proton hits infinite charged plane, find charge of plane

  1. Oct 7, 2007 #1
    1. The problem statement, all variables and given/known data

    An electron is released from rest 2.0 cm from an infinite charged plane. It accelerates toward the plane and collides with a speed of 1*107 m/s

    What is the surface charge density of the plane?

    2. Relevant equations


    3. The attempt at a solution

    therefore a∆t = 1*107 m/s

    calculating the time ∆t requires knowledge of either v0 or a, v0 is zero, so one cannot calculate it using v0, so the other option is to use a, which is unknown also

    How would I go about this?

    Once I have a, i can find E using the formula a=(qE)/m

    Last edited: Oct 7, 2007
  2. jcsd
  3. Aug 3, 2008 #2
    The electric field intensity of an infinite charged plate is given by-


    E0=8.854*10 powered to -12 S is the surface charge density.

    substitue the above formula as the E for the the a=(qE)/m then proceed as planned.

    report if your work was done
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