September 7, 2010University Physics, Chapter 222Review -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’ LawGauss’s Law: the electric field flux through S is proportional to the net charge enclosed by S q00qE dAE dA
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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