# lecture5 - Gausss Law ctric Flux Ele Gausss Law ple Exam s...

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Gauss’s Law Electric Flux Examples

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Gauss’s Law Gauss’s Law What’s in the box ??
Quiz Quiz What’s in the box ?? A) Negative charges B) Positive charges C) No charge

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Gauss’s Law Gauss’s Law What’s in the box ?? Net # of lines going out is related to the charge enclosed
Recall electric flux: dA uur E ur A E d E = - Scalar quantity - related to number of filed lines

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For a closed surface S, the element of area vectors point outward from the surface. The surface may be a real surface or just an ‘imaginary’ mathematical surface of our choosing. dA uur
Gauss’s Law Gauss’s Law For a closed surface S, take the outward direction as the direction for ; then… dA r Net outward flux through S net charge enclosed by S ο ε = 2 12 2 "permittivity of vacuum" 8.85 10 N C m ε - = × 1 and 4 e k π =

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Or… The closed “Gaussian surface” S is arbitrary (and usually exists only in your imagination).
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## This note was uploaded on 01/23/2011 for the course ENG 1D04 taught by Professor Done during the Spring '08 term at McMaster University.

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lecture5 - Gausss Law ctric Flux Ele Gausss Law ple Exam s...

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