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Use Gauss’s law to calculate the electric field at a distance r from a point charge...

Use Gauss’s law to calculate the electric field at a distance r from a point charge +q. Hints: (1) If you use a spherical shell of radius r as your closed surface, then by symmetry the magnitude of the electric field is the same at all points on the sphere, and thus E can be factored out of the integral. (2) Since 4 r^2 is the equation for the area of the surface of a sphere, ´ dA = 4 r^2.

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