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Will the current in the wire attract each other

by ENDLESSYOU
Tags: attract, current, wire
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ENDLESSYOU
#1
Nov28-12, 10:19 AM
P: 29
I wonder whether the current in a single wire will attract each other?
Eventually shrink to a line?
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mfb
#2
Nov28-12, 10:59 AM
Mentor
P: 11,925
In which way?
If you consider a current in a cable with finite cross-section and no net charge, electron density might be a big higher in the interior due to magnetic fields. I think I calculated that once, and the result was very small for realistic current flows. A higher electron density adds repulsion, which cancels the magnetic forces soon.


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