Charge separation and photocopying: Putting it all together
A Van de Graaff generator is placed in rarefied air at 0.4 times the density of air at atmospheric pressure. The average distance that free electrons move between collisions (mean free path) in that air is (1/0.4) X 10-6 m. Determine the positive charge needed on the generator dome so that a free electron located 0.20 m from the center of the dome will gain at the end of the mean free path length the 2.0 X 10-18 J of kinetic energy needed to ionize a hydrogen atom during a collision.
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