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Magnetic field and magnetic force

  1. Apr 4, 2014 #1
    1. The problem statement, all variables and given/known data
    two long parallel straight wire are seperated by a distance r in vacuum. an electric current flow through each wire in opposite direction, the magnetic flux density at the centre between 2 wires is (2)(ε0)/(πr) (ANS FROM BOOK) ... can someone explain why?

    my ans would be 0.5x2x(ε0)/(πr)... because the resultant between 2 wires is repulsive force...

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 5, 2014 #2

    Simon Bridge

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    The force between the wires being repulsive or attractive is irrelevant.
    Do you know the equation for the flux density at different distances due to a single long wire?
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