Para magnetic substances : These substances are feebly attracted by a magnet. When placed in a magnetizing field, they are feebly magnetized in the direction of the field, that is, the magnetization I in para magnetic materials is weak, but in the same direction as the magnetizing field, thus, they have a small positive susceptibility Xm . Curie’s law: States the susceptibility ‘ Xm‘ of a para magnetic substance varies inversely as the kelvin-temperature of the substance,ie..