Walker, Halliday & Resnick — Maxwell's Equations; Magnetism of Matter: Problem 22

22 Figure 32-23 gives the magnetization curve for a paramagnetic material. The vertical axis scale is set by $a = 0.15$, and the horizontal axis scale is set by $b = 0.2$ T/K. Let $M_{sam}$ be the measured net magnetic moment of a sample of the material and $M_{max}$ be the maximum possible net magnetic moment of that sample. According to Curie’s law, what would be the ratio $M_{sam}/M_{max}$ were the sample placed in a uniform magnetic field of magnitude 0.800 T, at a temperature of 3.80 K?