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How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 28.0 cm in diameter to produce an electric field

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How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 28.0 cm in diameter to produce an electric field of 1490 N/ C just outside the surface of the sphere? AED ? N = electrons Submit Request Answer Part B What is the electric field at a point 15.0 cm outside the surface of the sphere? AED ? E= N/C

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