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Homework Help: Boundary conditions for P

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data
    Use a Gaussian surface and an Amperian loop to derive the electrostatic boundary conditions for the polarisation field P at an interface between electric media 1 and 2 of relative permittivities e1 and e2. (Hint: determine results for D and E first)

    2. Relevant equations

    3. The attempt at a solution
    The boundary conditions for E and D I know. I know that the restrictions on P will have something to do with the bound charge at the interface, and I know that [tex]P = D - \epsilon_{o}E[/tex]. I am not sure what Gaussian surface or Amperian loop I should use, and how I should use it.
  2. jcsd
  3. Sep 7, 2010 #2
    [tex]\int D \cdot ds=4\pi \rho[/tex]
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