In Millikan's oil drop experiment. What ...

In Millikan's oil drop experiment. What is the terminal speed of an uncharged drop of radius `2.0 times 10^-5 m` and density `1.2 times 10^3 kg m^-3`. Take the viscosity of air at the temperature of the experiment to be `1.8 times 10^-5 Pa s`. How much is the viscosity force on the drop at that speed? Neglect buoyancy of the drop due to air.

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`5.8 cm s^-1,3.9 times 10^-10 N`

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