The relation between the magnetizing field H and the magnetic field B can also be expressed as the magnetic permeability: μ = B / H. The permeability of ferromagnetic materials is not constant, but depends on H. In saturable materials the permeability increases with H to a maximum, then as it approaches saturation inverts and decreases toward zero
上面是在维基百科上看到的，有两个问题：
1.磁导率不是常数？依赖于H
2.当增加H到一定程度导致磁饱和， μ会减小一直到零？ |
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