Electromagnetism formula question

Discussion in 'Homework Help' started by Kai Jie, Sep 2, 2016.

  1. Kai Jie

    Thread Starter New Member

    Jul 11, 2016
    3
    0
    Is the magnetic path length(L) equal to the mean circumference, 50π mm?
    If yes, then for question (c), should I skip it and go to question(d)&(e) to calculate (R) and (Fm), then only answer (c)?
    Also, please help check if all formula used is correct or not.
     
  2. MrAl

    Well-Known Member

    Jun 17, 2014
    2,429
    490
    Hello,

    The magnetic path length is taken to be the mean circumference if the cross sectional area is constant and the material is uniform throughout.
     
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  3. wayneh

    Expert

    Sep 9, 2010
    12,103
    3,038
    Agreed. Think of it as the average length of all the various field lines. I suppose for an irregular cross section it would be the area-weighted average length. So if most of the material is at the outer perimeter, the average field line would be longer than if most of the cross section is at the inner edge.
     
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  4. Kai Jie

    Thread Starter New Member

    Jul 11, 2016
    3
    0
    Thanks for the help guys.
     
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