Hi, I'm just given the magnetic susceptibiliy of materails [tex]\chi[/tex], for which I'm supposed to identify what class of magnetic materail they belong too. Some basic rules are listed in the notes. Ferromagnets [tex]\chi > 0, u >> 1[/tex] cold rolled steel 2250 Monimax 669 Paramagnets [tex]\chi > 0, u > 1[/tex] Oxygen (liquid at -219 C) 3.9E-4 Manganese 1.0E-6 Chorium 4.5E-6 Diamagnet ([tex]\chi < 0, u < 1[/tex] Ice - 8.1E-6 (I know ice XI is ferrielectric) Helium - 0.58E-6 However I looked on wiki and it appears Chormium is antiferromagnetic and manganese is non-magnetic. I'm fairly sure sure helium is a superconductor. This is question 1, on an easy work sheet so I'm not sure what to answer.