A0.80-um-diameter oil droplet is observed between two parallel electrodes spaced

Question

A0.80-um-diameter oil droplet is observed between two parallel electrodes spaced 11 mm apart. The droplet hangs motionless if the upper electrode is 26.6 V more positive than the lower electrode. The density of the oil is 885 kg/m3 What is the droplet's mass? Express your answer to two significant figures and include the appropriate units. m2.4x10-16 kg Previous Answers Correct Part B What is the droplet's charge? Express your answer to two significant figures and include the appropriate units. HA 8.75.10 C Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

(A) mass = volume x density

m = (4 pi R^3 / 3) (rho)

m = (4 x pi x 885 x (0.80 x 10^-6 / 2)^3)/3

m = 2.4 x 10^-16 kg .......Ans

(B)   

Fe + Fg = 0

q E = -m g and E = V/d

(q) (26.6 / (11 x 10^-3)) =- 2.4 x 10^-16 x 9.8

q = - 9.6 x 10^-19 C

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