Cecil Moore wrote:
John Smith wrote:
[said, "gray areas exist!]

In a coil wound on an iron-core toroid, do you believe
the flux follows the wire in the coil and ignores the
iron in the toroid?


At designed freqs, permeability of core material, turns
size/spacing--the core OVERWHELMS all other forms of magnetic
coupling--I cannot even begin to think how I would measure EM coupling
between turns in such an environment ...

Coupling is, of course, not nearly that good in an air-
core coil but coupling exists nonetheless. Some of
the current generated in a coil is through the air-core
transformer action between coils.

Air core, EM coupling between turns exists, in what degree--I simply
cannot, probably, afford the equipment to measure ...

As I stated, for at least the most part, we are in agreement ... it
seems only logical ... however, things are not always as they seem (now,
how's that for "wiggle room?" ;-) )

Regards,
JS