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I Thompson's Absolute Electrometer

  1. May 22, 2017 #1


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    Suppose that the force needed to push a disc down on top of another disk = weight x g, then the two discs are charged with opposite quantities of electricity, then the weight removed, and still the discs remain together due to the force of attraction between the discs; so then the electric force between them is equal to the force from the weight, right? this implies that Wg = (V^2A)/[(8PI)D^2], V is voltage, A is the area of the top disc, D is the distance between them: How to explain the equation? what is the significance of 8pi?
    Last edited: May 22, 2017
  2. jcsd
  3. May 22, 2017 #2


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    Why doesn't anyone answer?
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