In article <3d95c51c@news.povray.org>, jim### [at] blueyonder couk says...
> Also for the point charge thing there is a very simple equation (which
> totally escapes me at the mo) but I try a web search for "coulombs law"
F = -1/(4*Pi*Epsilon_0) * q*Q/r^2
q,Q are the charges of the balls
Epsilon_0 is a physical constant (8.854 * 10^-12 kg*m^3/(s^2*C^2))
r is the distance between the centers of the two balls.
Lutz-Peter
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