On Thu 08 Dec 2005 06:00:12, Franc Zabkar
wrote:

The magnetic field produced by any number of turns of mains flex is
zero. Think about it.

Hmmm. Yes. :-)

I was hoping to use a compass deflection as a way of telling how much
heat/power was being lost in neatly wrapped coiled of mains flex.

Surely there is a loss of something due to the neatness - or perhaps
not?