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Homework Help: Where is the neutral point between 2 wires

  1. Nov 22, 2004 #1
    There are 2 long wires A and B, placed 10cm apart. The currents in 2 wires are the same, 0.3A downwards. Where is the neutral point, how far is it from wire A?
     
  2. jcsd
  3. Nov 22, 2004 #2
    If the two wires have the same current in the same direction then the neutral point should be dead center because the magnetic field at a radius r from both wires would be the same. Assuming the two wires are placed flat on a page going up and down and the current is moving up (A being to the left of B), the field from B is moving out of the page 5cm from the wire and the field from A is moving into the page 5cm from that wire. Long answer for a short question.
     
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