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Homework Help: Interaction Energy

  1. Mar 5, 2009 #1
    Hi. in my notes the interaction energy is simply stated as being

    [itex]W=\int dV \rho(\vec{r}) \phi_{ext}(\vec{r})[/itex]
    however no explanation is given as to where this comes from.
    is it simply a fact or should i be able toderive this from somewhere?
     
  2. jcsd
  3. Mar 5, 2009 #2

    lanedance

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    Homework Helper

    I think this essentially assumes you initially have an external potential phi, then this is the energy required to move the given charge distribution ito that potential from infinity
     
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