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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
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I am having a hard time seeing how the surface charge density equals the d field normal to the surface in this case?