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Re: Charged disk; was electrostatic ...

Separate spheres widely.
Connect them with a long wire.
Charge the system.
Remove the wire.
Now you have two spheres at the same potential and sufficiently isolated
from each other to allow a closed form calculation giving:

Q1/R1^2 = {Q2/R2^2}*{R2/R1}

IOW the ratio of the surface charge densities is the inverse of the ratio
of the radii. Check my math :)

Bob Sciamanda
Physics, Edinboro Univ of PA (em)