BiotSavart 2.1 data file { Current Current ; ID current 0 1 } { Loop Loop current 100 wireDiameter 0.1 cm loop 1 0.62673 cm winding -1 loop 1 -0.62673 cm } { Planar Planar grid 20 20 start 0 0 u 0 1.5 cm v 1.5 0 cm plotrange 0 80e-4 contour 10e-4 plot b }