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5. If the earth's electric field is 100 N/C downward, how many extra electrons must be...

5. If the earth's electric field is 100 N/C downward, how many extra electrons must be on a 100-g object for it to be suspended in air?

a) 7.35×1016 b) 8.58×1016 c) 9.80×1016 d) 5.11×1016 e) 6.13×1016

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