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Vacuum permeability

The vacuum permeability or magnetic constant is an ideal physical constant for the value of magnetic permeability in a classical vacuum and equal to $4\pi10^{-7}$.

Symbol
$\mu_0$
Unit
H/m

Default
1.2566370614359173e-06

Used in
$L_a$
Self inductance of conductor [H/m]
$L_i$
Inductance of conductor i [H/m]
$L_m$
Inductance (mean) [H/m]
$m_{z,ar}$
Parameter m of armour
$m_{z,c}$
Parameter m of conductor
$m_{z,e}$
Parameter m of earth
$m_{z,s}$
Parameter m of shield
$m_{z,sc}$
Parameter m of screen
$m_{z,sh}$
Parameter m of sheath
$v_{prop}$
Velocity of propagation [km/s]
$X_1$
Positive sequence reactance [$\Omega$/m]
$X_a$
Self reactance of conductor [$\Omega$/m]
$X_{ap}$
Equivalent mutual reactance between conductors [$\Omega$/m]
$X_{ar}$
Self reactance of armour [$\Omega$/m]
$X_c$
Mutual reactance between middle and outer cables in flat formation with earth return [$\Omega$/m]
$X_{cp}$
Zero-sequence reactance steel pipe [$\Omega$/m]
$X_d$
Reactance steel pipe [$\Omega$/m]
$X_e$
Self reactance of screen/sheath [$\Omega$/m]
$X_{ij}$
Mutual reactance between two conductors i and j [$\Omega$/m]
$X_L$
Mutual reactance between outer cables in flat formation [$\Omega$/m]
$X_m$
Mutual reactance between conductors flat formation without transposition [$\Omega$/m]
$X_{mut}$
Mutual reactance [$\Omega$/m]
$X_s$
Self reactance of screen/sheath [$\Omega$/m]
$X_{S1}$
Reactance section 1 [$\Omega$/m]
$X_{S2}$
Reactance section 2 [$\Omega$/m]
$X_{S3}$
Reactance section 3 [$\Omega$/m]
$X_{sw}$
Reactance skywire [$\Omega$/m]
$z_c$
Factor z to calculate skin effect coefficients for conductor
$Z_{ct}$
Self impedance of earth continuity conductor [$\Omega$/m]
$z_{encl}$
Factor z to calculate skin effect coefficients for enclosure
$Z_{kp}$
Impedance between cable k and p in ground [$\Omega$/m]
$Z_{mt}$
Equivalent mutual impedance between earth continuity conductor and any cable [$\Omega$/m]
$\mathscr{z}_2$
Impedance of insulation between conductor and screen [$\Omega$/m]
$\mathscr{z}_{34}$
Impedance of insulation between shield and armour [$\Omega$/m]
$\mathscr{z}_{56}$
Impedance of jacket [$\Omega$/m]
$\mathscr{z}_6$
Impedance of insulation between screen and sheath [$\Omega$/m]