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

  • Thread starter FOIWATER
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  • #1
FOIWATER
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Homework Statement


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

Homework Equations


rho s = D dot an


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?
 

Answers and Replies

  • #2
FOIWATER
Gold Member
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Is it because it's at a conducting surface
 

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