L13_a - ELECTRIC FLUX (section 19.8) Electric flux is a...

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Unformatted text preview: ELECTRIC FLUX (section 19.8) Electric flux is a quantity that is proportional to the number of electric field lines (EFL) passing through a given area. Will develop precise definition Very important concept. Will be used to relate electric field to charge. 1 st step : Define a vector associated with a small element of area on a surface SURFACE NORMAL is a vector perpendicular to an element of surface area with a magnitude equal to the area, A , of the surface element 2 nd step: Define flux for through an area in a region of uniform E r Flux through area element A with normal parallel to E r is EA = E Flux through area element A with normal at an angle to E r is cos E EA = o cos A is the projection of area onto plane perpendicular to E r o Electric flux through area A decreases as angle between surface normal and E r increases 3 rd step: General case Surface may be curved and E r may be non-uniform For small enough i A : o Can treat area element...
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This note was uploaded on 03/08/2012 for the course PHYSICS 1051 taught by Professor Michaelmorrow during the Winter '12 term at Memorial University.

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L13_a - ELECTRIC FLUX (section 19.8) Electric flux is a...

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