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Charge on pith ball between two plates

  1. Dec 16, 2016 #1
    1. The problem statement, all variables and given/known data

    The mass of the ball is 40 milligrams, the applied potential difference is 480 V and the plate separation is 6 centimeters. If the string hangs at an angle of 20 degrees to the vertical, determine the charge on the pith ball.

    2. Relevant equations

    F=ma
    E=F/q
    V=E/d

    3. The attempt at a solution

    This is my work shown to the end, although the answer is wrong I'm not sure what I missed, and any help would be greatly appreciated. The answer is supposed to be 1.8x10^-8, but I'm not sure how to get there.
    http://imgur.com/a/sgRUX
    eiUz7DD.png
     
    Last edited by a moderator: Dec 17, 2016
  2. jcsd
  3. Dec 16, 2016 #2

    haruspex

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    Really?
     
  4. Dec 17, 2016 #3

    gneill

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    Staff: Mentor

    Also:
    upload_2016-12-17_6-6-53.png

    Grams are not milligrams!
     
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