Magnetic Fields in A Material
See also: Magnetic field#H and B inside and outside of magnetic materialsIn a vacuum,
where μ0 is the vacuum permeability.
In a material,
The quantity μ0M is called magnetic polarization.
If the field H is small, the response of the magnetization M in a diamagnet or paramagnet is approximately linear:
the constant of proportionality being called the magnetic susceptibility. If so,
In a hard magnet such as a ferromagnet, M is not proportional to the field and is generally nonzero even when H is zero (see Remanence).
Read more about this topic: Magnetism
Famous quotes containing the words magnetic, fields and/or material:
“We are in great haste to construct a magnetic telegraph from Maine to Texas; but Maine and Texas, it may be, have nothing important to communicate.”
—Henry David Thoreau (1817–1862)
“But famished field and blackened tree
Bear flowers in Eden never known.
Blossoms of grief and charity
Bloom in these darkened fields alone.”
—Edwin Muir (1887–1959)
“Like the dead-seeming, cold rocks, I have memories within that came out of the material that went to make me. Time and place have had their say.”
—Zora Neale Hurston (1891–1960)