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Magnetic field strength help

  1. Mar 12, 2010 #1
    please help??

    1. The problem statement, all variables and given/known data

    I got 1/2 of this problem right, but I am not sure of the other part. I have attached the picture. The questions are as follows (with the answers that I am sure of) --

    What is the magnetic field strength at point 1 in the figure?
    What is the magnetic field direction at point 1 in the figure? (out of the page)
    What is the magnetic field strength at point 2 in the figure?
    What is the magnetic field direction at point 2 in the figure? (in to the page)
    What is the magnetic field strength at point 3 in the figure?
    What is the magnetic field direction at point 3 in the figure? (out of the page)

    2. Relevant equations

    B = permeability constant * I/ 2(pi)r


    3. The attempt at a solution
    Well, for the first one example, this is what I did.

    (1.257*10e-6)*(10)/2(pi)(.02m) = 1*10e-4

    This is not correct however? Can someone give me some instruction? And for the second and third ones, which wire am I calculating from?
     
  2. jcsd
  3. Mar 12, 2010 #2

    ideasrule

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    Homework Helper

    Re: please help??

    You haven't attached a picture.
     
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