Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook