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Finding the magnetic field strength

  1. May 4, 2015 #1
    1. The problem statement, all variables and given/known data
    There exists a current of 5A in the ay direction at x=2m,z=-2m where the ay is the unit vector in the y direction. Find the magnetic field strength at the origin.
    2. Relevant equations
    B = (μI/2πR) * r
    B = μH

    3. The attempt at a solution
    B = (μI/2πr)
    B= (4π*10^-7)(5)/2π(2)
    where r is the distance from origin, in this case r=2m.
    B=5*10^-7 T

    I believe I am not finding the correct distance from the origin.Not using the z axis at all.
    Thanks for the help!
    Last edited: May 4, 2015
  2. jcsd
  3. May 4, 2015 #2


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    Gold Member

    Amperes law:

    Cirkulation Hds = N * I →

    H = I / (2πr)

    r = √(22+22) (pythagoras).

    You should not find B, as it is the magnetic induction (flux-density).
    Last edited: May 4, 2015
  4. May 4, 2015 #3
    Hi Hesch, to find the distance from the origin are you using the following formula?
    √ X^2 + Y^2 + Z^2
  5. May 4, 2015 #4


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    Gold Member

    No, I'm using r = √(x2+z2)

    Plot the locations of the conductor and the origin in the plane: y = 0.
  6. May 4, 2015 #5
    Thanks for the help hesch!
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