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It is normal to specify the line voltage, that is the
root mean square of the electro-motive force between
any two of the energised lines.
The voltage amplitude for each such line follows from that.
However the electromagnetic field is much more easily obtained from a knowledge
of the surface charges.
These charges can reside on the surfaces of the lines, and on the ground plane.
Thus a key for solving the electromagnetic field problem is to determine the surface
charges that would give rise to the specified voltages.

Kabculus 2006-03-30