\twhen suspended in a uniform magnetic field, diamagnetic materials set their longest axis at right angles to the direction of the field and the shortest axis is along the direction of the field. why?

Dear Student,
Diamagnetic materials have porousness under 1 i.e they don't enable attractive lines of compel to go through them effectively. Subsequently the most brief hub remains along the heading of the field in order to confront lesser deterrent and trouble in passing. The longest pivot comparatively remains at right point to the bearing of field.