A magnetic structure is composed of a three ferromagnetic materials and wound on it is a current carrying coil with 200 turns as shown on figure 1.3 below. The parameters of the magnetic structure are as shown on table 1.3. Table 1.3: Parameter of the ferromagnetic Description Air gap Air Neglect fringing 2 Material Cross sectional area [cm] Length [mm] Figure 1.3 material Section A Nickel-iron alloy 2x10 200 Section B Silicon steel 2x10 120 Section C Cast steel 2x10 100 Assuming a magnetic flux of 1.2x10-3Wb to be established in the silicon core, calculate: a. the reluctance of the magnetic circuit b. the current that flows through the coil c. the relative permeability of each ferromagnetic materials