Art Unwin KB9MZ wrote:

Cecil
I would like to ask you a question regarding inductance coils even tho you
know I believe the current is constant

Current *is* constant in EZNEC's lumped inductive reactances, Art, but
that doesn't represent reality. This weekend, or maybe even tonight, I
will be posting coils modeled out of wire, like Wes has done, to make
my point.

An inductor develops a field that travels thru the core
and then slays out thru 360 degrees to return to the other end of the coil.
Thes lines are directly correllated to the current flow within the
inductance and are in equilibrium
in terms of mechanical forces.
If the current is not constant thru-out the inductance
then there are more lines of force at one end than there is at the other,
such that the ends would not repel each other,one end will domimate
something I have not seen happen.
How do you account for the inbalance of the end fields
because of so called current gradient that you refer to.If there is no
imbalance what happens to dissapate the energy created by the increase of
current flow ?
I would appreciate your input on the above problem.
even tho it appears so simplistic.

Capacitance is the answer, Art. If a transmission line didn't possess capacitance,
it wouldn't be able to exchange energy between the capacitive reactance and the
inductive reactance to allow the currents at 1/2WL intervals to be traveling in
opposite directions. A coil completely devoid of any capacitance would indeed have
a constant current. But there are no real-world coils that are completely devoid of
capacitance as illustrated by Roy's and Tom's real-world measurements.
--
73, Cecil http://www.qsl.net/w5dxp



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