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Electric field intensity on thin electric sheets

  1. Feb 26, 2017 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    The only equations I can think to use would be:
    But I'm not sure if they are useful or how they will help.

    3. The attempt at a solution
    I have the solution, it just isn't detailed...
    I don't understand where they get E=1/2ε. Should I be considering these as parallel plate capacitors?
  2. jcsd
  3. Feb 26, 2017 #2

    Doc Al

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    Staff: Mentor

    There are three sheets of charge. Each produces a field. To find the field at any point, add up the contributions from each sheet.

    What's the field from a sheet of charge? See this: Electric Field: Sheet of Charge
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