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In SI units, permeability is measured in henries per meter (H/m), or equivalently in newtons per ampere squared (N/A 2). The permeability constant μ 0, also known as the magnetic constant or the permeability of free space, is the proportionality between magnetic induction and magnetizing force when forming a magnetic field in a classical vacuum.
The volume magnetic susceptibility, represented by the symbol χ v (often simply χ, sometimes χ m – magnetic, to distinguish from the electric susceptibility), is defined in the International System of Units – in other systems there may be additional constants – by the following relationship: [4] [5] = , were
The relation between the magnetizing field H and the magnetic field B can also be expressed as the magnetic permeability: = / or the relative permeability = /, where is the vacuum permeability. The permeability of ferromagnetic materials is not constant, but depends on H .
Tungsten's desirable properties such as resistance to high temperatures, its hardness and density, and its strengthening of alloys made it an important raw material for the arms industry, [54] [55] both as a constituent of weapons and equipment and employed in production itself, e.g., in tungsten carbide cutting tools for machining steel. Now ...
where χ is called the volume magnetic susceptibility, and μ is called the magnetic permeability of the material. The magnetic potential energy per unit volume (i.e. magnetic energy density) of the paramagnet (or diamagnet) in the magnetic field is:
The Polder tensor is a tensor introduced by Dirk Polder [1] for the description of magnetic permeability of ferrites. [2] The tensor notation needs to be used because ferrimagnetic material becomes anisotropic in the presence of a magnetizing field. The tensor is described mathematically as: [3]
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