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Problem 5.25 Coulomb's law tells us that the electrostatic force between two
charged particles is
Q1Q2
4TEor2
F =
where Q1 and Q2 are the charges on the particles and r is the separation be-
tween them. The quantity 4neo is constant. Show that the electrostatic force is
conservative. Obtain an expression for the potential energy.

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find the electrostatic potential everywhere inside the duct?
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