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claim that the finite size of the sheet
has a negligible effect for the geometry chosen?
It probably *does* have a negligible effect on the overall value for
the interelectrode resistance. But this does not mean that it has a
negligible effect on the potential values out in the parts of the
paper that are distant from the close vicinity of the electrodes, and
it does not mean that the equipotential curves out there are only
negligibly distorted from circles.
A variational principle is at work here.
Effectively, the error in the resistance (& field
energy, & capacitance) is proportional to the *square* of the error
in the potential used to calculate it.