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Point charge configuration with zero potential energy

  1. Aug 16, 2012 #1
    is it possible to construct a system with only finite number of point charges of arbitrary magnitude at finite distance from each other such that the total potential energy is zero everywhere?
    i doubt earnshaw's theorem would prohibit this construction, hence is it possible?
    thanks
     
  2. jcsd
  3. Aug 17, 2012 #2
    If by potential energy , you mean the following integral:

    [itex]W=\int{\frac{1}{2}\epsilon E^{2}dv}[/itex],

    then zero total energy means zero electric field everywhere . Zero field around a point charge means zero net flux and this contradicts Gauss law.
     
  4. Aug 18, 2012 #3
    thanks for the reply.
    i think that integral only apply to continuous charge distributions? doesnt it predict the energy of a point charge is infinite.
    on another note i think i got the answer, apparently it is possible to assemble point charges such that they have no mechanical energy

    bigerst
     
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