Physics - Modern Physics Question with Solution | TestHub

An oil drop of the radius$2 \mathrm{mm}$with a density$3 \mathrm{g}$${\mathrm{cm}}^{-3}$is held stationary under a constant electric field$3.55\times {10}^5 \mathrm{V} {\mathrm{m}}^{-1}$in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess?$\left(\text{consider} g=9.81 \mathrm{m} {\mathrm{s}}^{-2}\right)$.