The magnetic susceptibility of a paramagnetic substance is:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$. Consider a ferromagnetic material:
Assertion $(A)$: The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.
Reason $(R)$: At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature.
In the light of the above statements, choose the correct answer from the options given below:

If a magnetic substance is kept in a magnetic field,then which of the following substances is thrown out?

There are $2.0 \times 10^{24}$ molecular dipoles in a paramagnetic salt. Each has a dipole moment of $1.5 \times 10^{-23} \text{ A m}^2$. Find the maximum (saturation) magnetization in the specimen. (in $\text{ A m}^2$)

The relative permeability $(\mu_r)$ of a ferromagnetic substance varies with temperature $(T)$ according to the curve shown in the figure.

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature,then it will show