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a metal sphere has a charge of +11μC. What is the net charge after 7.2e13 electrons have have been placed on it?
Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 3.0 x 1013 electrons are removed from one sphere and placed on the other. (a) What is the magnitude of the electrostatic force that acts on each sphere? (b) Is the force attractive or repulsive? Why?