ch23_p85 - 85. (a) The diagram below shows a cross section...

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85. (a) The diagram below shows a cross section (or, perhaps more appropriately, “end view”) of the charged cylinder (solid circle). Consider a Gaussian surface in the form of a cylinder with radius r and length A , coaxial with the charged cylinder. An “end view” of the Gaussian surface is shown as a dotted circle. The charge enclosed by it is 2 , qVr ρρ == π A where 2 Vr A is the volume of the cylinder. If ρ is positive, the electric field lines are radially outward, normal to the Gaussian surface and distributed uniformly along it. Thus, the total flux through the Gaussian
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