PASCO ES-9070 COULOMB BALANCE - Manual (Page 16)

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