The variation of magnetic susceptibility ( ) with temperature for a diamagnetic substance is shown correctly by graph

Step-by-step solution

The magnetic susceptibility of a diamagnetic substance is a small, negative quantity resulting from induced electron orbital motion under an external magnetic field. Unlike paramagnetic materials, this induced moment exhibits negligible temperature dependence as thermal agitation does not significantly affect the relevant electron orbits. Consequently, remains constant and negative across all temperatures T . The behavior shown in graph (A) —constant negative versus T —correctly represents diamagnetism. In contrast