What is magnetic susceptibility? For which material is it low or high?

Hint: Magnetic susceptibility is the ratio between magnetization and magnetic field strength. Paramagnetism and diamagnetism can be defined by magnetic susceptibility. If magnetic susceptibility is less than zero and it’s anti-aligned then the material is diamagnetic. If magnetic susceptibility is more than zero and it's aligned then the material is paramagnetic.

Complete step by step answer:
Magnetic susceptibility is a constant that demonstrates the degree of magnetization of an object when it is subjected to an external magnetic field. It is a dimensionless proportionality constant. When applied, the magnetic field interacts with electrons and nuclei materials get magnetized. Nuclei and electrons each possess spin, a quantum mechanical property with no relation with classical physics.
$M=\chi H$
Where M is the magnetization of the material,
            $\chi $ is magnetic susceptibility,
            H is magnetic field strength $M=\chi H$
For paramagnetic materials, the magnetic susceptibility is low and positive. In paramagnetic materials, electrons align with the applied field and are attracted to regions of greater magnetic field.

Additional information:
Magnetic susceptibility demonstrates whether a material is attracted towards or repelled away from a magnetic field. Paramagnetic materials align with the external applied field. They are attracted to regions of higher magnetic fields. Diamagnetic materials are anti-aligned with external magnetic fields. They are repelled toward regions of lower magnetic fields. With the application of an external magnetic field, the magnetization takes into account the magnetic field of the material itself.

Note:
The total magnetization of the material and volume is provided by a related parameter called permeability. A quantitative measure of the magnetic susceptibility also provides information about the material’s structure, its bonding and energy levels. Along with that, it is widely used in geology, paleontology and gemology.