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Homework Help: Gauss's Law Electricity: Electric Field Between 2 Sheets

  1. Sep 25, 2009 #1
    1. The problem statement, all variables and given/known data
    The electric field between two square metal plates is 180 N/C. The plates are 1.0 m on a side and are separated by 3.0 cm, as in the figure. What is the charge on each plate? Neglect edge effects.

    2. Relevant equations
    i don't know how to make any fancy sybols sorry

    charge density = charge / (area x Eo)

    electric field = charge density / 2
    3. The attempt at a solution

    180 = charge density/(2 x 8.85e-12)
    charge density = 3.186e-9

    3.186e-9 = Q / 1
    Q = 3.186e-9

    I know that the distance between the two sheets has to be taken into consideration, but I'm not sure where.
  2. jcsd
  3. Sep 25, 2009 #2
    never mind, i figured it out. distance doesn't matter at all.

    [STRIKE]180[/STRIKE] 90 = charge density/(2 x 8.85e-12)
    charge density = [STRIKE]3.186e-9[/STRIKE] 1.593e-9

    [STRIKE]3.186e-9[/STRIKE] 1.593e-9 = Q / 1
    Q = [STRIKE]3.186e-9[/STRIKE] 1.593e-9
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