Consider a system of 1025 electrons in an external magnetic field of 2 T. Each electron is in an l = 1 orbit. There is strong spin--orbit coupling, so that the only allowed combinations (lz,sz) are (1, 1/2), (0, 1/2), (0, -1/2), (-1, -1/2). For this material, find
(a) the Curie constant,
(b) the magnetic moment at 290 K,
(c) the magnetic moment at 3 K.