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> Am wondering what kind of voltage i can get from a 16" or 20" sphere ?...
For a given R, V is limited by E, which in turn is limited by corona
discharge into the air. This maximum E value depends on atmospheric
conditions, but as an example:
using E = 500,000 Volts per meter (a crude guess), and R = 0.5 meter gives
V= 0.25kV.