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Math Help - cat uderstand certain parts of the solution

  1. #1
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    cant uderstand certain parts of the solution

    here is the question and solution:
    http://i29.tinypic.com/30cy4cn.jpg


    i cant understand certain things in here:
    i cant understand the 3d picture.
    why the magnetic field in the z direction??

    i cant understand how did they find the mutual inductance here.
    because by this formula

    M_{12}=\frac{N_2\phi _{12}}{I_1}

    in our situation we need to find the current in the celonoid
    but they for some weird reason find the emf
    and right after without any calculation
    they show the mutual induction coeff

    why??
    Last edited by transgalactic; August 28th 2009 at 08:55 AM.
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