Physics Help Forum Hard electrostatics question

 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.