Physics - EM Waves Question with Solution | TestHub

A charged dust particle of radius$5\times {10}^{-7} \mathrm{m}$is located in a horizontal electric field having an intensity of$6.28\times {10}^5 \mathrm{V} {\mathrm{m}}^{-1}$. The surrounding medium in air with coefficient of viscosity$\mathrm{\eta }=1.6\times {10}^{-15}\mathrm{N} \mathrm{s} {\mathrm{m}}^{-2}.$If this particle moves with a uniform horizontal speed of$0.01 \mathrm{m} {\mathrm{s}}^{-1},$the number of electrons on it will be