Will the current in the wire attract each other

  1. I wonder whether the current in a single wire will attract each other?
    Eventually shrink to a line?
     
    Last edited: Nov 28, 2012
  2. jcsd
  3. mfb

    Staff: Mentor

    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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