> F = -1/(4*Pi*Epsilon_0) * q*Q/r^2

Isn't that the same as F = -r^2 / (4 * Pi * Epsilon_0 * q * Q)?

> q,Q are the charges of the balls
> r is the distance between the centers of the two balls.

I'm with you. (I think...)

> Epsilon_0 is a physical constant (8.854 * 10^-12 kg*m^3/(s^2*C^2))

So... 8.854e-12 is the number... kg*m^3 is the unit... what's the s^2 * C^2
bit about?

Andrew.

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