Longitudinal relative permeability steel wires

The longitudinal relative permeability of steel wires varies with the particular sample of steel. Unless reference can be made to measurements on the steel wire to be used, some average value must should be assumed. No appreciable error is involved if, for wires of diameters from 4 mm to 6 mm and tensile breaking strengths around 400 N/mm$^2$, a value of $μ_e = 400$ is assumed.

Symbol
$\mu_e$

Default
400