a water droplet wita radius of 7 mm remans stationary in air due to a balance of
ID: 2239636 • Letter: A
Question
a water droplet wita radius of 7 mm remans stationary in air due to a balance of gravittinal forcess and electric forces actin on charges i water droplet. the electric fields of the earth in the region of droplet is 150 N/C. we want to deermine how may excess electron charges the droplet has. a. draw the direction of the electric field acting on this negatively chaged droplt of water explain. b. if he density of water is 1000 kg/m^3, and the volume of a sphere is calculated by v = 4.19 R^3, calculate the mass of the rain droplet in the qustion. c. using your answer to part b, determin the electric force acting on this droplet, explaain. d. calculate the amount of charge on th rain droplet. e. determine how many excess electons are in this water droplet.Explanation / Answer
a) so we need electric force up to have that electric field points down
b) M = d V = 1000*4.19*(7.0E-3)^3=0.001437 kg
c) electric force = mg = 0.001437*9.81=0.0141 N
c) F = q E
q = F/E = 0.0141/150=0.000094 C
d) N = q/e = 0.000093/1.6E-19=5.87E14
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