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Specifically, a disturbance in the charge pattern with
wavelength lambda will die out exponentially with a time
constant tau, where
tau = (eps0 lambda^2) / (k L)
where 1/k is the resistivity of the paper
Explain this LAMBDA, please.
When I plot the calculated
equipotential lines in the plane of symmetry ...
ignoring the paper size effect ...
The pattern for two point charges and the pattern for two
long cylinders are not identical.
If you use a crummy voltmeter, you will get all sorts of
goofy answers, even with ordinary resistor paper, let
alone with any higher-resistivity substance. That's
especially true in regions far from the sources, i.e.
where the fields are relatively small.
Are you saying that static surface charges will be responsible
for the boundary conditions?
If so then blaming the "paper
boundary" (for the discrepancy we are addressing) and
blaming "surface charges" amounts to the same thing.