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I carelessly quoted
when a pulse is sent down a simple cable (e.g. coaxial),
the edge of the electric field is moving at c.
John Denker responded (as well as Bernard Cleyet) to this. Of course I should
have clarified that c refers to speed of light in a given medium (or nearly so)
which is not the same as speed of light in vacuum.
Catt writes
(<http://www.electromagnetism.demon.co.uk/w99anbk2.htm>):
"Consider the case when the battery and lamp are connected by two very long
parallel wires, their length being 300,000 kilometres. When the switch is
closed, current will
flow immediately into the front end of the wires, but the lamp will not light
for the first second. A wave front travels forward between the wires at the
speed of light,
reaching the lamp after one second.
What is interesting to me is that according to Catt two experts in
electromagnetism gave different answers to his question.