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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 `2.0xx 10^5` m and density `1.2xx 10^3 kg m^-3`. Take the viscosity of air at the temperature of the experiment to be `1.8xx 1 0^-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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