skin effect

• To: tesla-at-pupman-dot-com
• Subject: skin effect
• From: Parpp807-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 11 May 1999 08:49:38 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Antonio,
I see your reference to the two parallel conductors as more of a simple 
current balance than as relating to skin effect properties. Strictly 
speaking, skin effect is not so much a
magnetic property as it is the consequence of inductive reactance when we are 
talking
about A.C. The charge resides on the surface of the conductor because the 
self-inductance of the wire produces its own X sub L. But X sub L increases 
with frequency so
with D.C., X sub L is zero and skin effect results solely from the repulsion 
between like charges.
The way I learned it, the X sub L is greatest where the flux is the densest 
near the center
of the conductor, making the impedance a minimum at the surface of the 
conductor. All
this, of course, will also take place in the more complicated geometry of a 
solenoid and
the math gives me an itchy skin effect.  I think any edition of Sears & 
Zemansky will have
a discussion of this.  :>))

Ralph Zekelman
l 

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