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Homework Help: Cant uderstand certain parts this

  1. Aug 28, 2009 #1
    here is the question and solution:

    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

    [tex]M_{12}=\frac{N_2\phi _{12}}{I_1}[/tex]

    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

  2. jcsd
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