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Old Jan 3rd 2009, 11:16 PM   #1
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Hard electrostatics question

1. The problem statement, all variables and given/known data
An object with a charge of +4.0 x 10^-18 C and a mass of 1.1 x 10^-15 kg is held stationary by balanced gravitational and electric forces midway between horizontal charged plates as shown. What is the applied voltage V?


2. Relevant equations



3. The attempt at a solution
I don't really know how to start this question out. Could someone please tell me what it is that I should start out with or find?
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Old Jan 7th 2009, 05:20 PM   #2
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For gravity you can use $\displaystyle F = mg $
For electric force use $\displaystyle F = \frac{QV}{d} $ because $\displaystyle *\frac{V}{d} $ is the electric field.

Last edited by vincisonfire; Jan 7th 2009 at 05:29 PM.
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