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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 xx 10^-5m` and density `1.2 xx 10^3 kg m^-3`? Take the viscosity of air at the temperature of the experiment to be `1.8 xx 10^-5` Pa s. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.

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