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Electrostatic Force Equation Help!

  1. Feb 9, 2009 #1
    I'm doing a video analysis and there is a charged ball that a woman is holding and there is another charged ball hanging from a string with length L. The video is of the woman pushing the ball closer to the ball from the string and how it pushes it away and I am using LoggerPro to analyze the video.

    I need help finding a derived equation for the expeimental value of the electrostatic force magnitude as a function of L,x,m,r, and g.

    The previous steps to deriving the equation have the following equations:
    Ftension = mg/cos(theta)

    Felec - Ftens(sin(theta))=0 N

    Help!

    Thanks
     
  2. jcsd
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