Re: Copper tubing

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mike Harrison by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mike-at-whitewing.co.uk>

On Thu, 12 Apr 2001 08:05:16 -0600, you wrote:

>Original poster: "James Lewis Nance by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jlnance-at-intrex-dot-net>
>
>On Wed, Apr 11, 2001 at 06:16:56PM -0600, Tesla list wrote:
>> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
><A123X-at-aol-dot-com>
>> 
>> If the high frequency electricity travels on the outer surface of
conductors 
>> then does it travel on the outside surface of copper pipe, and the inside 
>> surface?
>
>Just the outside surface.
..but surely the 'inner' surface is actually part of the outer surface
of the _body_ of copper. How does the current 'know' which side of the
wall it is on, unless the ends are electrically closed?

Consider a flat strip - presumably current flows on both surfaces. Now
bend it longditudally into a tube - how does current know not to flow
on what is now the inside of a tube ? 

I may be totally wrong of course....!