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Uniform Charge Denisty

  1. Apr 12, 2007 #1
    1. The problem statement, all variables and given/known data

    ou've hung two very large sheets of plastic facing each other with distance d between them, as shown in the figure View Figure . By rubbing them with wool and silk, you've managed to give one sheet a uniform surface charge density eta_1= - \eta _{0} and the other a uniform surface charge density eta_2= + 3 \eta _{0} . What is the electric field strength at
    POINT 1 (TO THE LEFT OF THE NEGATIVE PLATE)
    POINT 2 (BETWEEN THE PLATES)
    POINT 3 (TO THE RIGHT OF THE POSITIVE PLATE)

    Specific distances are not given, all the the distances ("radius's") from the plates are the same.

    2. Relevant equations

    I was under the impression that only parrallel plate capacitors have uniform charge. So indeed all the charges will be different.
    Would the point 1 be Net charge=o? Or would it be 1(nu)-3(nu)=-2nu?

    3. The attempt at a solution

    Im my book it says Efield of plane= N/(2xEpsilon) Using that info, I said point 2 is equal to 3/2 (n/E). I was wrong, SO obviously I dont know what I am doing. Help. :yuck:
     
  2. jcsd
  3. Apr 13, 2007 #2

    Mentz114

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    Gold Member

    There's no figure.
     
  4. Apr 14, 2007 #3

    Meir Achuz

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    -1-(+3)=-4.
     
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