The electric field near the surface of Earth points
Chapter , Problem 40(choose chapter or problem)
The electric field near the surface of Earth points downward and has a magnitude of (a) Compare magnitude of the upward electric force on an electron with the magnitude of gravitational force on the electron. (b) What charge should be placed on a Ping-Pong ball of mass 2.70 g so that the electric force balances the weight of the ball near Earths surface?
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