In Millikan's oil drop experiment, what ...

In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of radius `2.0xx10^(-5)m` and density `1.2xx10^(3)kgm^(-3)` ? Take viscosity of liquid `=1.8xx10^(-5)Nsm^(-2)`. (Neglect buoyancy due to air).

`3.8xx10^(-11)N`

`1.8xx10^(-10)N`

`3.9xx10^(-10)N`

`5.8xx10^(-10)N`

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