- #1
realslow
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Homework Statement
Find the charge on the oil drop in Coulombs, and the number of electrons it is "missing".
Vplates= 2400 V
Dplates = 0.020 m
Oil Density = 850 kg/m3
Oil Drop Radius = .000051 m (from Stokes’ Law)
Homework Equations
[tex]E[/tex] = V/d
Volume = 4/3πr3
m= density x volume
The Attempt at a Solution
[tex]\Sigma[/tex] = (2400 V)/(0.020 m) = 1.2 x 105
Volume = 4/3 π(0.000051)3 = 1.7456 x 10-12 m3
m = (850 kg/m3)(1.7456 x 10-12 m3) = 1.4838 x 10-19 kg
And this is where I got to... now I know that Fe = Fg and I was thinking I could find Fg, but am stuck :( I would appreciate it if you could help me out!