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Approximate Sphere Capacitances - from WinTesla

Diam. in inches   pico-Farad

• 2              5.68

• 3              8.52

• 4            11.36

• 5            14.20

• 6            17.03

• 7            19.87

• 8            22.71

• 9            25.55

• 10          28.39

• 11          31.23

• 12          34.07

• 13          36.91

• 14          39.75