Question

At Curie temperature the ferromagnetic materials get converted into.
A. non- magnetic material.
B. paramagnetic material.
C. dia- magnetic material.
D. All of the above.

Answer 1

We should know about Curie temperature, different types of magnetic materials and how the dipoles are arranged in it.
We should know that the Curie temperature can also be used to describe the phase transition between Ferroelectricity and Para electricity.

Complete step by step answer:
We know that Above Curie temperature ferromagnetic material behaves like paramagnetic materials. Their magnetic susceptibility starts varying linearly with temperature. Their $I$ become too small above Curie temperature. But at the point Below the Curie point—for example, $770{\text{ }}^\circ C{\text{ }}\left( {1,418{\text{ }}^\circ F} \right)$ for iron $--$ atoms that behave as tiny magnets spontaneously align themselves in certain magnetic materials. In ferromagnetic materials, such as pure iron, the atomic magnets are oriented within each microscopic region $\left( {domain} \right)$ in the same direction, so that their magnetic fields reinforce each other. In antiferromagnetic materials, atomic magnets alternate in opposite directions, so that their magnetic fields cancel each other. In ferromagnetic materials, the spontaneous arrangement is a combination of both patterns, usually involving two different magnetic atoms, so that only partial reinforcement of magnetic fields occurs.
But when we raise the temperature to the Curie point for any of the materials in these three classes disrupts the various spontaneous arrangements, and only a weak kind of more general magnetic behaviour, called Para magnetism, remains. One of the highest Curie points is $1,121{\text{ }}^\circ C{\text{ }}\left( {2,050{\text{ }}^\circ F} \right)$ for cobalt. Temperature increases above the Curie point produce roughly similar patterns of decreasing Para magnetism in all three classes of materials. When these materials are cooled below their Curie points, magnetic atoms spontaneously realign so that the ferromagnetism, antiferromagnetic, or ferromagnetism revives. Therefore, the nature of ferromagnetic materials becomes paramagnetic.
The Curie temperature is named after Pierre curie, which showed that magnetism was lost at a critical temperature.

So, the correct answer is “Option B”.

Note:
The Curie temperature neighbouring magnetic spines align parallel to each other in ferro magnet in the absence of an applied magnetic field. Also keep the concept of ferrimagnetism and ferromagnetism while completing the solution.