REALLY BASIC inductance question.

Discussion in 'The Projects Forum' started by guestcheap, Aug 22, 2012.

  1. guestcheap

    Thread Starter New Member

    Aug 4, 2012
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  2. cork_ie

    Member

    Oct 8, 2011
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    Relative permeability in this case would refer to the core
     
  3. wayneh

    Expert

    Sep 9, 2010
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    3,034
    Right, the permeability refers to the material that the magnetic circuit is passing through. It's analogous to the resistance of the material the electrical current flows through.

    Folks tend to forget that a magnetic field needs to flow like a current as well, and needs a path to complete its circuit. Cuts in the circuit require sending the field through air, a poor "conductor" of magnetic field lines with a permeability of near 1.
     
  4. DickCappels

    Moderator

    Aug 21, 2008
    2,651
    632
    If it is an air core coil, you can use 1.0 as the relative permeability.

    Relative permeability is the magnetic analogy of dielectric constant. Its the flux density that results from a given magnetic force for a given material with respect to that of a vacuum.
     
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