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241-22_lec-5 - Physics 241 Lecture 5 Y E Kim September 7...

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Physics 241 Lecture 5 Y. E. Kim September 7, 2010 Chaper 22 September 7, 2010 University Physics, Chapter 22 1
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September 7, 2010 University Physics, Chapter 22 2 Review - Gauss’s Law Gauss’s Law (named for German mathematician and scientist Johann Carl Friedrich Gauss, 1777-1855) states ( q = net charge enclosed by Gaussian surface S). If we add the definition of the electric flux we get another expression for Gauss’ Law Gauss’s Law: the electric field flux through S is proportional to the net charge enclosed by S   q 0 0 q E dA  E dA   
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Review - Charges and fields of a conductor In electrostatic equilibrium, free charges inside a conductor do not move. Thus, E = 0 everywhere in the interior of a conductor. Since E = 0 inside, there are no net charges anywhere in the interior by Gauss’s Law. Net charges can only be on the surface(s). The electric field is perpendicular to the surface(s). E
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