Lec04-42009

# Lec04-42009 - ture 4-1 Gausss Law: Qualitative Statement...

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cture 4-1 Gauss’s Law: Qualitative Statement Form any closed surface around charges Count the number of electric field lines coming through the surface, those outward as positive and inward as negative. Then the net number of lines is proportional to the net charges enclosed in the surface .

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cture 4-2 ©2008 by W.H. Freeman and Company
cture 4-3 ©2008 by W.H. Freeman and Company

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cture 4-4 ©2008 by W.H. Freeman and Company
cture 4-5 ©2008 by W.H. Freeman and Company

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cture 4-6 Reading Quiz 1 Which of the following statements contradict Gauss’s law? a) The electric flux through a closed surface depends on all the charges outside the closed surface. b) The electric flux through a closed surface is proportional to the net charges enclosed in the surface. c) Any closed surface can be used with Gauss’s law. d) An electric dipole inside a closed surface does not change the net flux through the surface.
Electric flux Summary \$ N E A E An μ = u u v v g # of field lines N = density of field lines x “area” where “area” = A 2 x cos θ General definition of electric flux: \$ E S E n dA Φ = u v g (must specify sense , i.e., which way) To state Gauss’s Law in a quantitative form, we first need to compute the Electric Flux. \$ E An

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## This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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Lec04-42009 - ture 4-1 Gausss Law: Qualitative Statement...

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