An electrical engineer has wound a coil around a carbon steel (ferromagnetic) rod with a relative magnetic permeability of 150 has a length of 10 cm and a diameter of 3 cm, as shown in Figure 1. (i) (ii) (iii) 1 = 10 cm d =3 cm Figure 1 Calculate the magnetic reluctance of the rod. The coil from part (i), which has 125 turns. Calculate the amount of current that the electrical engineer needs to apply to the coil in order to achieve a magnetic flux density of 0.2 T at the end of the carbon steel rod. Then, calculate the magnetic field intensity in the carbon steel rod. It is suggested to the electrical engineer to replace the low carbon steel rod to a mild steel one, because it has higher magnetic permeability, lower coercivity and lower remanence. Sketch a hysteresis curve of the mild steel material and explain what ceorcivity and remanence are