Material 2 Material 2 Material 1 Material 1 400 turns 500 turns g ь 400 turns g b 500 turns a Figure 1 Figure 2 An elect
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Material 2 Material 2 Material 1 Material 1 400 turns 500 turns g ь 400 turns g b 500 turns a Figure 1 Figure 2 An electromagnet is made from two different magnetic materials in the shape shown in figures 1 and 2. The dimensions of the former are shown. The width of material 1 shown as a is 0.48 m. The height of material 2 is shown as b is 0.25 m The cross sectional area of the unshaded region (material 1) is S=0.0025 m3 and the relative permeability is = 2000 For the shaded region (material 2) the cross section area is T=0.001 m3 and the permeability is Mr2 = 8000. The air gap between the shaded region is g=4mm. The windings in figure 1 have the the number of turns indicated, both carry a current of 10 A. The coils are wound so that in both cases the magnetic field, H generated is upwards. Pr1 (a)What is the approximate value of B. the magnetic flux density in the air gap? (Figure 1) [6 marks) (b)The windings are now placed around the pole pieces as shown in figure 2. The coils are wound so that the field is upwards. How much current would be required to produce the same B-field found for Figure 1 in the air gap? [5 marks] Explain your answers and any assumptions you use.