The magnetic moment of a diamagnetic atom is

$A$ paramagnetic substance is placed in a non-uniform magnetic field,then

What type of materials can be used to make an electromagnet?

For two types of magnetic materials $A$ and $B$,the variation of $\frac{1}{\chi}$ ($\chi$: magnetic susceptibility) versus temperature $T$ is shown in the figure. Then:

If a diamagnetic solution is poured into a $U-$ tube and one arm of this $U-$ tube is placed between the poles of a strong magnet with the meniscus in line with the field,then the level of the solution will:

The magnetic susceptibility is negative for