Packing material made of pieces of foamed polystyrene

Chapter 21, Problem 21.83

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Packing material made of pieces of foamed polystyrene caneasily become charged and stick to each other. Given thatthe density of this material is about 35 kg/m3, estimatehow much charge might be on a 2.0-cm-diameter foamedpolystyrene sphere, assuming the electric force between twospheres stuck together is equal to the weight of one sphere.

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