Re: Multipole expansion for a spherical layer charge distribution

In sci.physics.research message <Horacius.Rex.2o7bi4@xxxxxxxxxxxxxxxxx>,
Fri, 30 Mar 2007 13:32:02, Horacius.Rex <Horacius.Rex.2o7bi4@xxxxxxxxxxxxxxxxx> posted:

I have a random spherical distribution of N charges between radiuses
R1 and R2. N is up to 10^9 or more.I want to calculate the
electrostatic potential closed to the origin of the sphere. R1 and R2
are much bigger than the distance of this point to the origin.
...

If N is always large, and great accuracy is not needed, the charges will
be equivalent to a spherical shell, within which the potential is
constant.

There might be benefit in treating the situation as a perturbation of
that approximation.

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