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Total Excess Charge using a Coulomb Balance

  1. Nov 13, 2011 #1
    1. The problem statement, all variables and given/known data

    If conducting a Coulomb Balance experiment, and a question asks to estimate the total excess charge on a sphere with a conducting surface charged to 2,000,000V potential.

    Is there a specific equation I should be using to estimate this?

    Thank you.

    P.S. why are spheres used in such an experiment, and not some other shape?
     
    Last edited: Nov 13, 2011
  2. jcsd
  3. Nov 13, 2011 #2

    rude man

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    V = q/R
    'cause they make the math easy.
     
  4. Nov 13, 2011 #3
    Is it not C = 4∏ε0r

    (Sorry for large font, I was trying to obtain a small 0 beside ε!)
     
  5. Nov 13, 2011 #4

    rude man

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    Yes, sure. In either case though you have to know the value of r.

    (I assume you got the right formula for C of a sphere.)
     
    Last edited: Nov 13, 2011
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