What is Magnetic permeability & Relative Magnetic permeability?

Magnetic permeability is defined as the power of conducting magnetic lines of force by a substance. It is denoted by ‘μ‘ (mu).

Magnetic permeability of a substance is equal to the ratio of the magnitude of magnetic flux density (B) to the magnitude of magnetic field intensity (H).

The SI unit of Magnetic permeability is TmA-1

What is Relative magnetic permeability?

Relative magnetic permeability is defined as the ratio of the magnetic flux density in the substance (or material) to the magnetic flux density in the vacuum. It is denoted by ‘μr‘. It has no unit as it is dimensionless.


μo is known as absolute permeability of vacuum or free space and μ= 4π x 10-7 TmA-1

Also, we have

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