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Homework Help: Electric energy

  1. Mar 18, 2004 #1
    1)two different formulas for electric field is
    a)U=(1/2)Q1V1+(1/2)Q2V2+.....

    b)[tex]U=\int \frac{1}{2}\epsilon.E^2dv[/tex]

    Using these how could we perform an experiment to test where the energy located?

    2)Since the electric energy density is never negative, how can the mutual electric potential of a pair of opposite charges be negative?

    My idea on the first one was following an example in the lecture:
    radiowave is a very good example that the energy is on the field lines,because even you stop signalling, the field or the wave still exist in space.Any comment is welcome
     
    Last edited: Mar 18, 2004
  2. jcsd
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