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Magnetic force b/w wires of unequal length

  1. May 17, 2010 #1
    Is there a formula for the force between two parallel wires of non-equal length? Would one just use the length of the shorter of the two wires?
  2. jcsd
  3. May 17, 2010 #2


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    That would only work if the longer wire were very much longer.
    You can get the field of the longer, but finite, wire by the usual Biot-Savart integral with finite limits. Then integrate this field over the shorter wire.
  4. May 17, 2010 #3
    Thanks, that does makes sense.
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