# Uniform Current in Conductors

The solver offers now the possibility to define a uniform current in some specific conductors. The diffusion equation is not solved in these conductors, thus the BEM is not needed on their surfaces. This can save computational time and memory. These conductors can still be coupled with other conducting parts where the full Eddy current equations are solved (diffusion of the current through thickness, Lorentz forces, Joules heating etc.). For example, the geometry of coils can be greatly simplified by modeling it as a simple tore rather than with multiple turns. The approximation induced by such modeling is all the more true when the coil’s current oscillates at a low frequency (50 Hz) making the diffusion of the EM fields a very fast process. A Biot Savart law is used to compute the magnetic field generated by the current of these parts.