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Magnetic field in a infinitley long wire

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data
    An infinitely long wire lies along the z axis and carries a current of 12 A in the positive z direction. A second infinitely long wire is parallel to the z axis at x = 8.2 cm.

    a.)Find the current in the second wire if the magnetic field at x = 1.6 cm is zero.
    b.)What is the magnetic field at x = 5 cm?


    2. Relevant equations
    F=I(LxB)


    3. The attempt at a solution
    I am lost with this one.
     
  2. jcsd
  3. Nov 12, 2009 #2

    rl.bhat

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    Homework Helper

    What is the relevant equation for the field due to current carrying infinite long wire?
     
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