This can be written as
:<math> I(l) = \sum_{n=1}^N a_n f_n(l) \mathbf{\hat{s}_n} </math>
[[File:20_meshing_tn.gif]]
where l is the length coordinate along the wire with l=0 at its start point. [[File:21_meshing_tn.gif]] <math>f_n(l)</math> is the scaled and translated version of the linear basis function <math>f(l) </math> shown in the previous figure. [[File:22_meshing_tn.gif]] <math>\mathbf{\hat{s}_n}</math> is the unit vector along wire.
== Physical Structure & 3D Mesh Generation ==