The longitudinal relative permeability of steel wires depends on the particular sample of steel. The used value is an average value for wires of diameter from 4 to 6 mm.

Symbol
$\mu_{\mathrm{e}}$
Unit
-
Formulae
$400$
Used in
$H_{\mathrm{1}}$
$H_{\mathrm{1_{\mathrm{2}}}}$
$H_{\mathrm{2}}$
$H_{\mathrm{2_{\mathrm{2}}}}$