Curie Weiss Law: Overview, Questions, Preparation

Curie Weiss law is considered as one of the important laws in the electromagnetic field of physics. Curie Weiss law calculates the magnetic moment above a ferromagnet’s temperature in the paramagnetic area or region. This magnetic moment is determined by the external magnetic field, which consists of the magnet’s quantity. Some of the magnetic moment examples are the electric current loop, a bar magnet, a molecule, or an electron.

The curie is a unit to measure radioactivity. The value of curie is 3.7 x 1010 per second. Curie temperature and curie point are also derived from the curie. Curie temperature is the extreme temperature when magnets undergo to change their magnetic properties.

The formula of Curie Weiss Law is illustrated below:

Here, the C is the material-specific Curie,

T is the absolute temperature,

Tc is the Curie temperature.

The magnetic moments are dependent on the external fields of magnetic materials. It is the relationship between the absolute temperature and the material of the magnetic field. Some materials possess similar properties like magnetite and nickel. The temperature of ferromagnetic substances in the paramagnetic field is called Curie temperature.

Some of the Curie temperatures of the ferromagnetic substances are as follows:

1. The Curie temperature of the Iron (Fe) is 1,043K
2. The Curie temperature of the Gadolinium (Gd) is 293K
3. The Curie temperature of the Nickel (Ni) is 631K

Curie Weiss's law holds many assumptions and false derivations to determine the susceptibility. Let us discuss the credibility of the Curie Weiss formula which can be written as:

X ~ 1/ (T - Tc) y

Here, T > Tc is true but Tc, if replaced by the temperature, will give a higher value than Curie temperature, which is false.

There is no explanation as to why it happens. However, this formula is widely used regardless of the limitation.

As per the new pattern of 2021, the chapter 'Electromagnetism' for Class 12 holds a mere weightage of 3 marks. It only includes two questions in total, consists of an objective type question of 1 mark and one short question of 2 marks, making a total of 3 marks.

Example 1) Write examples of hard magnetic materials.

Answer – Hard magnetic metals are made up of iron or have a composition of iron. The example of hard magnetic metals includes Cobalt and aluminium.

Example 2) State the Curie temperature of Nickel and steel in Celsius.

Answer – The curie temperature of Nickel is 360°C, and the curie temperature of Steel is 770°C.

Example 3) Write the temperature when steel is set off to nonmagnetic.

Answer – The steel becomes nonmagnetic at the temperature of 1420°F.

Q: What do you mean by Curie Weiss Law?

Q: What is the constant value of Curie?

Q: What is Weiss's concept?

Q: What are soft magnetic materials?

Q: How can we calculate Curie?