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Simple question. But I was wondering, does my mac power cord create a magnetic field when its all coiled?

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Have a look at The DC part of the cord, after the transformer will have a unidirectional magnetic field. The ac one a varying sinusoidally field which will eventually produce electromagnetic radiation at 50 or 60 Herz – anna v Feb 13 '13 at 16:45
Hi Anna, for me this is a fantastic response, the detail is much appreciated, many thanks. I am however unsure how to mark this as the accepted answer as its a comment. – iancrowther Feb 15 '13 at 10:06
up vote 3 down vote accepted
  1. It doesn't have to be coiled. Magnetic fields will be created as long as you have a current through a wire.

  2. Coiling may make the field strength stronger.

  3. How strong the field strength is in practice also depends on the current through the wire and whether your power cable has shielding.

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