Q3. (25 points) The magnetization curve for material X under normal operating conditions may be approximated by the expression B = 160. A magnetic circuit contains a 12 [cm] length of material X, as well as a 0.25 [mm] air gap. Assume a uniform cross section of 2.5 [cm^2] and find the total mmf required to produce a flux of 10 [uWb].