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Physics, 18.07.2019 20:10 mackwackuwu

Problem 21-40a:
the electric field near the surface of earth points downward and has a magnitude of 153 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?
2.74×1012
problem 21-40b:
what charge should be placed on a plastic ball of mass 5.25 g so that the electric force balances the weight of the ball near earth's surface?

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Problem 21-40a:
the electric field near the surface of earth points downward and has a magnit...

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