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2) Last year, while arguing with Leigh Palmer, you were
saying that it is possible to use the relaxation method do
calculate densities of space charges at various locations.
...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
I considered a disturbance of the form
psi(t, x) = exp(-t/tau) sin(2pi x/lambda)
verified that it satisfied the equation of motion,
(not too near the boundaries) and solved for tau
as a function of lambda.
I do not know how to implement the above formula.