A thin, horizontal, 20-cmcm-diameter copper plate is charged to -4.3 nCnC. Assume that the electrons are uniformly distributed on the surface. What is the strength and direction of the electric field 0.1 mmmm above the center of the top surface of the plate? What is the strength and direction of the electric field 0.1 mmmm below the center of the bottom surface of the plate?

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