Properties of a diamagnetic material :
1. In the absence of an external magnetic field, the magnetic dipole moment of each atom / molecule of a diamagnetic material is zero.
2. A diamagnetic material is weakly repelled by a magnet.
3. If a thin rod of a diamagnetic material is suspended in a uniform magnetic field, it comes to rest with its length perpendicular to the field.
4. When placed in a nonuniform magnetic field, a diamagnetic material is repelled from the region of strong field.
5. The magnetic susceptibility (χm) of a diamagnetic material is small and negative.
6. χm is very nearly temperatureindependent.
7. The relative permeability (μr) of a diamagnetic material is slightly less than 1 and very nearly temperature independent.
8. If a diamagnetic liquid in a watch glass is placed on two closely spaced polepieces of a magnet, the liquid accumulates on the sides causing a depression at the centre.
[ Note : When the pole-pieces are moved apart, the effect is reversed, i.e., the diamagnetic liquid accumulates at the centre, where the magnetic field is weak.]
9. A diamagnetic liquid in a U-tube placed in a magnetic field shows a depression in the arm to which the magnetic field is applied.
10. If a diamagnetic gas is introduced between the pole-pieces of a magnet, it spreads at right angles to the field.
