1.8 Cast-steel 1.6 Silicon iron 1.4 Mild steel Flux density, B(T) 1.0 0.8 Cast iron 0.6 O. 0.2 1000 2000 3000 4000 5000 6000 7000 Magnetic field strength, H(A/m) Page 2 of 9 Version: 1.3 Public Date: 19 July 2023 P Pearson | BTEC "In electromagnetism, permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. In other words, it is the degree of magnetization that a material obtains in response to an applied magnetic field. Magnetic permeability is typically represented by the Greek letter u (Mu)." 1. The material permeability u is given by the equation u = B/H From the graphs provided, determine u at a magnetic field strength of 4000 Am- for all the materials shown on the graph. Show all you intercepts on the graph. 2. State which of those materials has the highest magnetic flux density when a magnetic field strength of 4000Am-1 is applied 3. Explain the most suitable hysteresis loop for use in a transformer with reference to the following parameters: Hysteresis loop shape Coercive force Hard/soft material VI Remanence