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I have set up a relaxation calculation in Excel based on the Laplace....
equation in cylindrical coordinates.
The charge density on the surface of the disc must now be inferred by
looking at the difference between numbers at the surface. The electric
field intensity is proportional to the surface charge density, and the
gradient of the potential field is the relevant parameter here.
When I have a converged result I can make another spreadsheet (not iterative)
which will show the charge density on the surface. It won't be great
right on the sharp edges