Electromagnetism

In electromagnetism, permeability is the
measure of the ability of a material to support
the formation of a magnetic field within itself.
Hence, it is the degree of magnetization that a
material obtains in response to an applied
magnetic field. Magnetic permeability is
typically represented by the Greek letter μ. The
term was coined in September 1885 by Oliver
Heaviside . The reciprocal of magnetic
permeability is magnetic reluctivity .
In SI units, permeability is measured in henries
per meter (H·m −1), or 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 a measure of
the amount of resistance encountered when
forming a magnetic field in a classical vacuum .
The magnetic constant has the exact (defined)
[1] value µ 0 = 4π×10 −7 H·m −1≈
1.2566370614…×10 −6 H·m −1 or N·A −2 ).
A closely related property of materials is
magnetic susceptibility, which is a measure of
the magnetization of a material in addition to
the magnetization of the space occupied by the
material.
Explanation
In electromagnetism, the auxiliary magnetic field
H represents how a magnetic field B influences
the organization of magnetic dipoles in a given
medium, including dipole migration and
magnetic dipole reorientation. Its relation.