Charged oil drops enter uniform electric field, Oil turned into a fine mist of charged droplets, Light to illuminate oil drops, Weight = mg , #1 PD altered to suspend charged oil drop, #1 Microscope to observe stationary drop, #1 When PD is applied, F=Eq to balance weigh, Electric Field = V/d, Charge q, radius r, density p , #2 In freefall, Drag balances Weight, #2 Microscope to observe terminal velocity, #2 PD switched off to allow freefall.

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