Hi,nI attached the image of the system I am using. In the picture below you can see in violet the area where I am calculating the magnetic field (the big one rectangle). In the graph you can see the result of a transient using an Helmholtz coil I generate this sinusoidal wave, but by adding the property to the bars on the right in the picture, I can't see almost any difference. They are permanent magnets of Alnico 5, so they should generate an appreciable magnetic field in the area I am measuring.n