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If the capacitance can be represented by a matrix, then the question
of what is meant by the diagonal
terms of the capacitance matrix naturally arises.
These are referred to as the self capacitances.
Define the background potential at a surface to mean that part of the scalar potential which
is due entirely to the charges on the other surfaces.
Then the charge on a surface is equal to the self capacitance of that
surface times the difference between its scalar potential and the background
potential.

Kabculus 2006-03-30