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Joining two wires, magnetic fields and a little algebra

  1. Feb 12, 2012 #1
    1. The problem statement, all variables and given/known data
    Consider a general point on the line joining the two wires and a distance d
    away from the mid-point O. By summing the magnetic field due to currents of magnitude i flowing in both the wires which are non-zero, show that on the line joining the two wires, the magnetic field strength is given by:

    B= μ iD / π(D2 −d2)

    2. Relevant equations
    (D^2 −d^2) = (D+d)(D-d) ****** a simple trig identity
    B= μ i / 2π d

    3. The attempt at a solution
    I'm kinda stuck - any pointers on where to start?
  2. jcsd
  3. Feb 13, 2012 #2
    Just bumping it back up - anyone any ideas?
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