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Homework Help: What does nonpermeable mean?

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data

    I'm reading Jackson Section 5.10, where he solves for a uniformly magnetized sphere "embedded in a nonpermeable medium." I'm not looking for an example, but to understand what it means. It can't mean there is no B or H field external to the sphere; in fact, Jackson has a figure showing field lines. Does it perhaps mean that there is no source of B or H external to the sphere? But if that's the case, wouldn't the exterior region be free space which has a permeability?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 21, 2009 #2


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    The definition of magnetically non-permeable is that the material has the same magnetic permeability of free space [itex]\mu=\mu_0[/itex], and hence will have zero magnetization.
  4. Nov 21, 2009 #3
    Thanks, I can accept that. Just seems like an odd choice of words (or maybe my many years working with fluid flow in porous media . . .)
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