L14_a - WHAT DOES ELECTRIC FLUX THROUGH A CLOSED SURFACE...

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WHAT DOES ELECTRIC FLUX THROUGH A CLOSED SURFACE TELL US ABOUT THE CHARGE ENCLOSED BY THE SURFACE Electric field lines: start on positive charges end on negative charges For a CLOSED surface around a volume of space: the NET number of Electric Field Lines entering/leaving through the surface (i.e. the electric flux): o must depend on the amount of positive/negative charge INSIDE No charge inside: net number of lines leaving = 0 all lines go through Positive charge inside: non-zero net number of lines leaving lines start on charge inside sphere
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GAUSS’S LAW Connects: charge enclosed by closed surface to NET Electric Flux through surface Look at positive charge + q at centre of a sphere of radius r At every point on surface: i A E r r || o i A r is surface normal at that point Component of E r perpendicular to surface is 2 e n | | r q k E E = = r (at every point on surface) So for every point on surface: i i i A r q k A E A E = = 2 e n r r
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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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L14_a - WHAT DOES ELECTRIC FLUX THROUGH A CLOSED SURFACE...

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