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-   -   Will the current in the wire attract each other (http://www.physicsforums.com/showthread.php?t=655414)

ENDLESSYOU Nov28-12 10:19 AM

will the current in the wire attract each other
 
I wonder whether the current in a single wire will attract each other?
Eventually shrink to a line?

mfb Nov28-12 10:59 AM

Re: will the current in the wire attract each other
 
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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