III. Millikan Oil Drop Experiment Joe found a Millikan Oil Drop Experiment apparatus in storage and set it up in our lab classroom. In the process of setting it up, he did not enjoy interacting with the oil that forms the drops in the apparatus. In an effort to make the lab exercise "less greasy" (in his words), he replaced the usage of oil drops with very small pith balls made of styrofoam coated in conductive paint. Joe, however, did not adjust any of the variables and their values in the lab manual write-up. If the pith balls are all made of the same Styrofoam material and all have the same radius, how might one adjust the formulas used in the data analysis for this lab exercise. Please consider the following formulas from the original lab exercise using oil drops: a= -9nvg 2p/g • • = = where m'a³p'a³ (poll- Pair) is the effective mass of the droplet (after the mass of air it displaces is taken into account), g = 9.803 ms is the acceleration due to gravity in Chicago, and n = 1.859x105 kgms is the air viscosity under the experimental conditions (temperature, humidity, etc.). 6лna(ve-vg) 6mmad 1 q= = E E with an oil of density Poil = 917.3 kgm³ on a day for which pair = 1.17 kgm³. The magnitude of the electric field was E = 322.1 kNC¹ and the distance the drops move, d= 11.09 mm. Also, t, is the time taken for the oil drop to fall a known distance d and te, is the time taken for the oil drop to move upwards the same known distance d due to electric field induction.

III. Millikan Oil Drop Experiment Joe found a Millikan Oil Drop Experiment apparatus in storage and set it up in our lab classroom. In the process of setting it up, he did not enjoy interacting with the oil that forms the drops in the apparatus. In an effort to make the lab exercise "less greasy" (in his words), he replaced the usage of oil drops with very small pith balls made of styrofoam coated in conductive paint. Joe, however, did not adjust any of the variables and their values in the lab manual write-up. If the pith balls are all made of the same Styrofoam material and all have the same radius, how might one adjust the formulas used in the data analysis for this lab exercise. Please consider the following formulas from the original lab exercise using oil drops: a= -9nvg 2p/g • • = = where m'a³p'a³ (poll- Pair) is the effective mass of the droplet (after the mass of air it displaces is taken into account), g = 9.803 ms is the acceleration due to gravity in Chicago, and n = 1.859x105 kgms is the air viscosity under the experimental conditions (temperature, humidity, etc.). 6лna(ve-vg) 6mmad 1 q= = E E with an oil of density Poil = 917.3 kgm³ on a day for which pair = 1.17 kgm³. The magnitude of the electric field was E = 322.1 kNC¹ and the distance the drops move, d= 11.09 mm. Also, t, is the time taken for the oil drop to fall a known distance d and te, is the time taken for the oil drop to move upwards the same known distance d due to electric field induction.