The most exotic diamagnetic materials are

One of the following substances having the tendency to move from a stronger region to a weaker region of the magnetic field is:

$A$ paramagnetic sample shows a net magnetization of $0.8 \text{ A m}^{-1}$ when placed in an external magnetic field of strength $0.8 \text{ T}$ at a temperature of $5 \text{ K}$. If the temperature is raised to $20 \text{ K}$, then the magnetization becomes: (in $\text{ A m}^{-1}$)

The susceptibility of a magnetic material is positive and small. The material is

Materials suitable for permanent magnets must have which of the following properties?

The magnetic susceptibility is negative for