Find the mass and radius of the drop

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A charged oil droplet falls 5.0 mm in 20.0 s at terminal speed in the absence of an electric field. The specific gravity of air is 1.35 x10^(-3) and that of oil is 0.75. The viscosity of air is 1.80 x 10^(-5) N s/m2.

(a) What are the mass and radius of the drop?

(b) If the droplet carries two units of electric charge and is in an electric field of 2.5 x 10^5 V/m, what is the ratio of the electric force to the gravitational force on the droplet?

Reference no: EM13248578

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