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

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Unformatted text preview: Lecture 4-1 Gausss 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 . Lecture 4-2 2008 by W.H. Freeman and Company Lecture 4-3 2008 by W.H. Freeman and Company Lecture 4-4 2008 by W.H. Freeman and Company Lecture 4-5 2008 by W.H. Freeman and Company Lecture 4-6 Reading Quiz 1 Which of the following statements contradict Gausss 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 Gausss law. d) An electric dipole inside a closed surface does not change the net flux through the surface. Lecture 4-7 Electric flux Summary N E A E An = # of field lines N = density of field lines x area where area = A 2 x cos General definition of electric flux: E S E ndA = (must specify sense , i.e., which way) To state Gausss Law in a quantitative form, we first need to compute the Electric Flux....
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This note was uploaded on 04/23/2011 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue University-West Lafayette.

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

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