# Component of inductance $H_2$

Second component of inductance due to first layer armour steel wires.
For steel tape armour, the length of lay $p_a$ is assumed to be equal to the mean diameter of the first armour layer $d_{a_1}$.

Symbol
$H_{2_{1}}$
Unit
H/m
Formulae
$\frac{1.0 \cdot 10^{-7} d_{f_{1}}^{2} \mu_{e} n_{a_{1}} \pi \sin{\left(\beta_{a_{1}} \right)} \sin{\left(\gamma_{a} \right)}}{d_{a_{1}} p_{a_{1}}}$
Related
$\beta_{a_{1}}$
$d_{a_{1}}$
$d_{f_{1}}$
$\gamma_{a}$
$H_{2_{2}}$
$p_{a_{1}}$
Used in
$B_{2_{1}}$