Re: Cancel magnetic field in one current carring wire

Thinking123 wrote: 
Can anyone suggest the best way to shape a single wire carring a
current so that it's magnetic field cancels itself out?  Completely if
possible.  I'm trying to optimize the idea for light weight and varying
current values.  All I can think of would be to bunch the wire into a
tight zig-zag plane. (From:---------- To:||||||||) Would that work?  Or
would it produce the same field...and just be heavy?  Any help would be
great, thanks.

The only way to cancel the magnetic field of a current is to have that current return by the same path. The best you can do is to use a coaxial wire, with the current going out in one conductor and coming back through the other. A twisted pair is pretty good. A twisted quad (two wires at the corners of the cross section carrying one way, the wires at the other two corners of the cross section carrying the other way), is better, etc.
.

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