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In electromagnetism, permeability is the degree of magnetisation of a material that responds linearly to a magnetic field. Absolute permeability is represented by the symbol μ. In SI units, permeability is measured in henrys per metre. is known as the Permeability of free space (absolute permeability below)
Permeability in linear materials owes its existance to the approximation:
Where is a dimensionless scalar called the Magnetic Susceptibility
According to the definition of the Auxillary Field,
μ is the permeability, measured in henrys per metre
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