Question about electromagnetism

Discussion in 'Homework Help' started by thexy, Apr 16, 2016.

  1. thexy

    Thread Starter Member

    Dec 13, 2015
    126
    0
    In the approximately ideal magnetizable iron circle with two different air gaps two coils are arranged concentrically. Calculate the mutual inductance without regard to the scattering.
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    I have results but I don't understand some parts so if someone would like to help me, I would be thankful.
    First they use Ampere's law:

    B_1\delta _1+B_2\delta _2=\mu_0N_1I_1
    I don't understand this at all, why this sum, why those formulas?
    Than Gauss's law:
    \Phi =B_1A_1=B_2A_S
    I understand this part.

    And than they use:
    \Phi_{v2} = -\Phi N_2
    From where comes this minus?
     
  2. MrAl

    Well-Known Member

    Jun 17, 2014
    2,418
    488
    Hello,

    Did you try this problem using reluctance instead? Often comes out much simpler.
    I'd have to look that up again myself, but you could try that yourself first.
     
  3. thexy

    Thread Starter Member

    Dec 13, 2015
    126
    0
    I haven't learned that in school
     
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