Assertion: total magnetic field | /r/HasProperty | divided by the permeability
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text: …… by the).The latter equation says that the total magnetic field (divided by the permeability) equals the free magnetic field plus the bound magnetic field (the bound magnetic field is all those little loopy currents that make things magnetic).When an electric current produces a magnetic field, it couldn't care what the field is going to be used for (ie for bold sweeping field lines or pokey little loops inside matter), so it produces a total field, which it's sensible to measure asBut once we put matter in the way, we can only measure thefield,.