For rotating magnetic fields the checkbox RMF
in the **Magnetic Fields** dialog has to be chosen, and the following parameters have
to be specified:

Number of

**Pole pairs****Magnetic induction (T)****Sample radius (m)****Rotating frequency (Hz)**of the external magnetic field**Model:**one can choose two models: One has a homogeneous B0 function in z-direction (Roplekar and Dantzig - see*Bibliography*), the other not. The latter model cannot take into account the effects of insulating wall. Only applicable for metallic samples and high aspect ratios**Mag. center position [m]**Inhomogeneous model: Position of the center of the magnet in CrysMAS coordinates.**Halfwidth of mag. field [m]**Inhomogeneous model: Halfwidth of the Gaussian distrbution describing the B(z) function.

Now you can compute the Lorentz forces:

Select the region in the furnace.

Check the

**Electrical Potential**box in the**Physical Phenomena**dialog.Start computation by selecting

**Computation**>**Start Computation**or by clicking on .For actually computing the Lorentz forces, you need to check the

**Lorentz Forces**box in the**Physical Phenomena**dialog.

See tutorial Simulating Rotating Magnetic Fields and Computing Lorentz Forces.