In the Millikan's oil drop method, which of the following force does not act on the oil drop?

Which of the following forces act on oil drops in Millikan's experiment?

Millikan's oil drop experiment established that

Millikan's oil drop experiment established that

Millikan's oil drop experiment established that

In Millikan's oil drop experiment, the charge on a oil drop was found due to an experimental error, to be 8.88 xx 10^(-18)C . Why can't such a quantity of charge be present on the oil drop ? Explain. (Charge on an electron is 1.6 xx 10^(-19)C )

An oil drop of 10 excess electron is held stationary under a consatnt electric field of 3.6xx10^(4)NC^(-1) in Millikan's oil drop experiment. The density of oil is 1.26gcm^(-3) . Radius of the oil drop is (Take, g=9.8ms^(-2), e=1.6xx10^(-19)C )