Physics Help Forum Hard electrostatics question
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 Jan 4th 2009, 12:16 AM #1 Junior Member   Join Date: Oct 2008 Posts: 8 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? Attached Thumbnails
 Jan 7th 2009, 06:20 PM #2 Junior Member   Join Date: Oct 2008 Posts: 12 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 06:29 PM.

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