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Calculating Charge Of Electron (Millikan Oil Drop Experiment

  • #1
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Homework Statement


I was doing the Milikan Oil Drop Experiment from a simulation this site: http://scienceclub.ucoz.com/index/0-109. I tried calculating the charge of the electron but it was from the real value.

Oil Density: 920 (kg/m^3)
Viscosity of Air: 1.81×10−5 kg/(m*s)
Distance: 0.0025 m

Homework Equations


q = (6πηr(v1 + v2)d) / V
η = viscosity of air
r = radius
v1 = terminal velocity
v2 = velocity of oil drop with x-ray on
d = Distance
V = Balancing Voltage

The Attempt at a Solution


Here the data that I took regarding the experiment. Please don't edit anything. I allowed permission to edit so you can see the automation I had done on it. https://docs.google.com/spreadsheets/d/1Ac_3WuWi14Rfhduq2n_ZEBYI6s-qXRIczJrT46vedyI/edit?usp=sharing
 

Answers and Replies

  • #2
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Your times are quite short and I would be interested in how you derived the formula for the charge. Better: Start with a description of what you measured.
All your charge values are way too large, I agree.

You can't take the average (or at least it won't help). The drops will in general have different multiples of the elementary charge on them. You have to find some sort of common divisor of their observed charges (not in the mathematical sense as the measurements are not exact).
 

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