http://www.physics.uci.edu/~advanlab/millikan.pdf
Everything is in the link above. Note E = voltage/distance between plates
in a millking oil drop eperiment horizontally place are 0.5cm apart when there is no p.d across the plate the terminal speed of an oil drop is 1.75*10-4-5ms if thr potentail supply is switched on with the upper plate positve the drop is observed to remain stationary when the p.d between the plate is 470.7v
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