In Equation \(\eqref{eq:7}\) \(d\overline{H}\) is the incremental static \(H\) field, \(I\) is current, \(d\ell\) is the vector of the length of a filament of current \(I\), \(\hat{a}_{R}\) is the uni...In Equation \(\eqref{eq:7}\) \(d\overline{H}\) is the incremental static \(H\) field, \(I\) is current, \(d\ell\) is the vector of the length of a filament of current \(I\), \(\hat{a}_{R}\) is the unit vector in the direction from the current filament to the magnetic field, and \(R\) is the distance between the filament and the magnetic field.
