Question 2: answer
For  , it results:
We can observe that, unlike the case when the permeability of iron is considered infinite, the electromagnetic torque is smaller, especially round q=0 position. The reduction is higher than 25% comparing to the case when the permeability of the ferromagnetic material is assumed to be infinite (figure 4).
|
Figure 4: The dependency of the torque vs. the position |
|
