View Single Post
  #598   Report Post  
Old March 23rd 06, 02:58 AM posted to rec.radio.amateur.antenna
Cecil Moore
 
Posts: n/a
Default Current through coils

John Popelish wrote:

K7ITM wrote:
What happens to that imbalance in charge? Where does it go? What do
we call something that behaves that way? What's so freakin' special
about that?


The charge briefly piling up and then being sucked out of such an
inductor is the same place charge piles up and is sucked out of parts of
a transmission lines with standing waves on them.


Seems you got sucked in by a myth, John. The forward current is equal
at both ends of the coil. The reflected current is equal at both ends
of the coil. That takes care of any question of charge imbalance. There
simply isn't any.

Assume the coil is 90 degrees long and that the forward current is one
amp and the reflected current is one amp.

At one end of the coil, the forward and reflected currents are 180
degrees out of phase. The standing wave current is zero.

At the other end of the coil, the forward and reflected currents
are in phase. The standing wave current is 2 amps.

Now do you see why standing wave current is considered not to be flowing?
--
73, Cecil http://www.qsl.net/w5dxp