When I was a kid, I wound a nail with enamel-coated wire, starting from the head of the nail, then when I reached the tip, I would wind towards the head again (still in the same direction of rotation though).
Was this a mistake?
Would I have had a stronger electromagnet if I had a straight run of wire back to the head of the nail, then proceeded with winding?
In short, no.
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It's the direction of rotation that matters, going straight back to the top and doing a second layer waould have wasted wire, and also made the turns looser, two bad things.
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Ok thanks guys!
Michael
No. It's the number of turns all going in the same direction that make it work.
As a thought experiment, consider replacing 100 turns of enameled wire with 100 turns of really thin insulated foil -- your electromagnet would behave pretty much the same at DC, although I wouldn't answer for any inter-winding capacitance issues.
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