gregz wrote in message
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"N_Cook" wrote:
What is the difference between N turns of wire of cross-sectional area A
and
2 parallel coils of N turns and wire area A/2 ?

Not sure about description, but seems like the layers would snuggle each
other better? Is that what your asking? Square wire is the best for
keeping
air gaps out or flat edge wound.

Greg


As far as i can see under x30 and feel, this coubled up fine wire is round
in section. I can see finer wire requires less intrusion into the former to
carry the fist axial run , before the first turn proper. Also able to make a
tighter bend perhaps with less localised stressing than the single wire
option.