What is the meaning of nonpermeable in Jackson's Section 5.10?

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SUMMARY

In Jackson's Section 5.10, the term "nonpermeable medium" refers to a material with magnetic permeability equal to that of free space, denoted as μ = μ₀. This indicates that the medium does not contribute any magnetization, allowing for the presence of external magnetic fields without interference. The discussion clarifies that while the medium is nonpermeable, it does not imply the absence of magnetic fields (B or H) outside the uniformly magnetized sphere.

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Homework Statement



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?

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The Attempt at a Solution

 
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The definition of magnetically non-permeable is that the material has the same magnetic permeability of free space \mu=\mu_0, and hence will have zero magnetization.
 
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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