1. The problem statement, all variables and given/known data I did the lab and have to analyze the data to determine the quantized charge of an electron. I have used the data to determine the 'total' charge on the observed drops using the following equation. 2. Relevant equations q = 3 ∏ r (E) η (Vup+Vdown) Where r is the known radius of the drop, E is the known electric field, η is the known efffective air viscosity and Vup and Vdown are terminal velocities of the particle going up and down (determined from data), respectively. 3. The attempt at a solution I have determined the charge on each of the drops observed. But I don't know how to further analyze the data to find what the charge is per electron. I presume it is the greatest common factor or highest common denominator but calculating that doesn't bring me any closer to the charge of an electron. Any suggestions? All of my q values are on the order of 10^-17, so I'm probably missing a factor of 100 somewhere but I don't know where. Everything in mm is converted to m in my calculations prior to solving. This is the main problem.