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Coulomb Balance
012-03760E
12
mg
mg/
q
m
q
0 mg
20 mg
40 mg
50 mg
70 mg
Table 2. Force Calibration
Data and Calculations
Torsion constant = K
tor
B
1 - 4a
3
/R
3
R
q
q
avg
q
corrected
1/R
2
Table 1. Force versus Distance
Data and Calculations
C (Capacitance of Electrometer System) =
V (Electrometer Voltage) =
q (Charge on sphere) = 2CV =
Table 3. The Charge on the Sphere