The 3-d gaussamp39s law is obtained after a volume, Ask an Expert

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The 3-D Gauss's law is obtained after a volume integration of the 3-D Poisson's equation and takes the form

Where the left-hand side is an integral of the normal electric field over a closed surface S, and Q is the net charge enclosed within S. Use it to derive the electric field at a distance r from a point charge Q(Coulomb's law). What is the electric potential in this case?

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