tsl125 - ~ E and ~ E . + + + + + + + + + + + + + + +...

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Parallel-Plate Capacitor with Dielectric (1) The polarization produces a bound charge on the surface of the dielectric. + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - + + + + + + + + + + + + + + + + - - - - - - - - - - - - - - - - - - - - - - - + + + + + + + + - +q f -q f +q f -q b +q b -q f E 0 E The bound surface charge has the effect of reducing the electric field between the plates from ~ E 0 to ~ E . A : area of plates d : separation between plates ± q f : free charge on plate ± q b : bound charge on surface of dielectric ~ E 0 : electric field in vacuum ~ E : electric field in dielectric tsl125 – p.1/2
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Parallel-Plate Capacitor with Dielectric (2) Use Gauss’ law to determine the electric fields
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Unformatted text preview: ~ E and ~ E . + + + + + + + + + + + + + + + +----------------+ + + + + + + + + + + + + + + +-----------------------+ + + + + + + +-+q f-q f +q f-q b +q b-q f E E Field in vacuum: E A = q f E = q f A Field in dielectric: EA = q f-q b E = q f-q b A < E Voltage: V = E d (vacuum), V = Ed = V < V (dielectric) Dielectric constant: E E = q f q f-q b > 1 . Permittivity of dielectric: = . tsl126 p.2/2...
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This note was uploaded on 04/30/2008 for the course PHYS 204 taught by Professor Andrevantonder during the Spring '07 term at Rhode Island.

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tsl125 - ~ E and ~ E . + + + + + + + + + + + + + + +...

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