"Lutz-Peter Hooge" <lpv### [at] gmxde> wrote in message
news:3d96e745$1@news.povray.org...
> In article <3d96d83d@news.povray.org>, orp### [at] btinternetcom says...
>
> > Isn't that the same as F = -r^2 / (4 * Pi * Epsilon_0 * q * Q)?
>
> Hu? No (beware: y/x*z = y*z/x and not =y/(x*z)).

Are you beginning to see why my math doesn't work? <sob!>

> > > 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?
>
> s^2 * C^2 also belongs to the unit (s: seconds, C: Coloumb).

Right... So if I let q and Q be the charge of my ball and magnet (what's the
correct unit for charge?), and I measure r in meters, then F will come out
in Netwons? While we're on the subject, what would be a suitable range of
magnitude for q and Q? (The ball is 80g in mass.)

Thanks!
Andrew.

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