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When does the surface charge density equal the electric flux density?

  1. Sep 17, 2013 #1

    FOIWATER

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    Gold Member

    1. The problem statement, all variables and given/known data
    The electric field intensity in polystyrene (relative permittivity 2.55) filling the space between the plates of a parallel plate capacitor is 10kV/m. The distance between the plates is 1.5mm.
    Calculate the surface charge density of free charge on the plates,
    and the surface density of polarization charge

    2. Relevant equations
    rho s = D dot an


    3. The attempt at a solution
    ---
    I am having a hard time seeing how the surface charge density equals the d field normal to the surface in this case?
     
  2. jcsd
  3. Sep 17, 2013 #2

    FOIWATER

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    Gold Member

    Is it because it's at a conducting surface
     
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