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Charge between two metal plates

  1. Feb 7, 2017 #1
    1. The problem statement, all variables and given/known data
    Two large metal plates of area 1.1 m^2 face each other, 6.2 cm apart, with equal charge magnitudes but opposite signs. The field magnitude E between them (neglect fringing) is 50 N/C. Find |q|.


    2. Relevant equations
    |q|=σA
    E=σ/(2Eo)⇒σ=2EoE
    |q|=2EoEA

    3. The attempt at a solution
    I thought that after I did the rearranging of formulas above that this would be a pretty simple problem
    |q|=2EoEA
    |q|=2(8.99E-9C)(50N/C)(1.1m^2)
    |q|=9.889E-7C
     
  2. jcsd
  3. Feb 7, 2017 #2

    haruspex

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    There are two plates.
     
  4. Feb 7, 2017 #3
    It seems that I used coulombs constant instead of the permittivity of free space
     
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