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Homework Help: Charge Stored on a Plate

  1. Oct 6, 2008 #1
    1. The problem statement, all variables and given/known data
    Two parallel plates, each of area 4.67 cm2, are separated by 3.93 mm
    with purified non-conducting water between them. A voltage of 5.39 V
    is applied between the plates.

    Find the charge stored on each plate. Answer in units of nC.

    2. Relevant equations

    [tex]C = K\frac{(\varepsilon_{0}A)} {d}}[/tex]

    [tex]Q = CV[/tex]

    3. The attempt at a solution

    Q = [ 5.39 * 80 * (8.85 * 10^-12) (4.67 * 10^-2) ] / (3.93 * 10^-3)

    Q = 4.534 * 10^-8

    When I convert that to nC I get 45.34 nC. What went wrong? =(

    Also, sorry for the horrible formatting! I'm having database errors when trying to use too much LaTex.
     
  2. jcsd
  3. Oct 7, 2008 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Tekmachine! :smile:

    (no need to use LaTeX … just use the X2 and X2 tags above the Reply field. :wink:)

    erm … 4.67 cm2 isn't (4.67 * 10^-2) m2. :smile:
     
  4. Oct 7, 2008 #3
    i feel so dumb, lol thanks!
     
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