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Problem 21-40a: The electric field near the surface of Earth points downward and has a magnitude of 142 N/C. What is the ratio of the magnitude of the upward electric force on an electron to the magnitude of gravitational force on the electron? 2.27E-17 Submit Answer Incorrect. Tries 3/5 Previous Tries Problem 21-40b What charge should be placed on a plastic ball of mass 5.16 g so that the electric force balances the weight of the ball near Earths surface? 3.56E-4 mC Submit Answer Incorrect. Tries 2/5 Previous Tries

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