On Jan 23, 4:43*pm, (Richard Harrison)
wrote:
Art wrote:

"David just for the record, skin depth is proportional to
frequency----."

Not exactly. Skin depth is inversely proportional to the square root of
the frequency.

For example at 1 Hz the skin depth is about 2.6 in. in copper. At 10 Hz.
it is about 0.826 in. and at 100 Hz the depth is about 0.260 in. and at
1000 Hz the depth is 0.0826 in. etc.

Best regards, Richard Harrison, KB5WZI

Yes, I should have used "varied" instead of "proportional" But the
essence of the posting is still correct namely, it is false to state
that the skin effect always penetrate thro out the conductor
as is the statement that a current cannot travel thru the center of a
conductor where the material is devoid of eddy currents but enclosedn
by a eddy current shield
This is not to say that with a applied AC current such a route is
chosen as I previously thought
Art