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I Increase in internal energy due to polarization of a dielectric

  1. Aug 1, 2018 #1
    I have a plate capacitor with a given charge. It is then dipped in a dielectric fluid and I must determine which height the fluid reaches(all the necessary parameters are given). I can solve this problem if I make the following assumption: the polarization of the dielectric does not( or approximately does not) change its internal energy.

    Is this a reasonable assumption? If so why?
     
  2. jcsd
  3. Aug 7, 2018 #2

    DrDu

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    Science Advisor

    No, it isn't. If you model polarisation P as a density of dipoles, what will be their energy in an electric field?
     
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