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Regarding Bernard C.'s recollection:
> ...
>One of my references pointed out that the resistance between two embedded
>electrode spheres in the earth (rather more closely infinite embedding
>medium) was ~ independent of their separation > a certain minimum
>separation. --IF I REMEMBER CORRECTLY.
You do remember correctly. As long as the two electrode spheres are
placed *much* farther apart from each other than each of their
individual radii, then the asymptotic finite resistance between them
is given by: R = ([rho]/(4*[pi]))*(1/a + 1/b) where [rho] is the
resistivity of the background medium and a & b are the respective
radii of each of the conducting electrodes spheres.
David Bowman
David_Bowman@georgetowncollege.edu