The electric field near the surface of earth points downward and has a magnitude of 160 n/c (a) compare the upward electric force on an electron with the downward gravitational force 2.8e12 . the electric force is is much larger. o both forces are equal. o the gravitational force is is much larger x (upward force/ downward force) (b) what magnitude charge should be placed on a penny of mass 6 g so that the electric force balances the weight of the penny near earth's surface?
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