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Homework Help: Find position, magnitude, and direction

  1. Mar 22, 2009 #1
    1. The problem statement, all variables and given/known data

    Three long wires( 1,2 and 3) are coplanar and hang vertically. The distance between wire 1 and 2 is 20 cm. On the left wire 1 carries an upward current of 1.5 A. To the right the wire 2 carries a downward current of 4 A. Wire 3 is located such that, when it carries certain current such that no net magnetic force acts upon any of the wires. Find the position of wire 3 and the magnitude and direction of the current in 3.

    2. Relevant equations


    3. The attempt at a solution

    I'm drawing a blank....This question confuses me.
  2. jcsd
  3. Mar 22, 2009 #2


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    Gold Member

    What is the magnetic field at a distance 'r' produced by an infinitely long wire with current 'I'?
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