Curie temperature is the temperature above which
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At Curie temperature, there is a change from ferromagnetic to paramagnetic behavior. Above this temperature, the paramagnetic substance obeys Curie Weiss law, even those resistances which are not ferromagnetic but only paramagnetic also obey Curie Weiss law above the Curie temperature only.
- paramagnetic material becomes ferromagnetic material
- ferromagnetic material becomes diamagnetic material
- ferromagnetic material becomes paramagnetic material
- paramagnetic material becomes diamagnetic material
The Correct Option is C
Approach Solution - 1
Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic material.
Curie Temperature is defined as the temperature at which certain materials lose their permanent magnetic properties, and are replaced by induced magnetism. Above this temperature, the paramagnetic substance obeys Curie Weiss law, even those resistances which are not ferromagnetic but only paramagnetic also obey Curie Weiss law above the Curie temperature only. Meaning, it is the temperature above which a ferromagnetic material becomes paramagnetic. In the case of rocks and minerals, remanent magnetism goes below the Curie point — about 570 °C (1,060 °F) for the common magnetic mineral magnetite.
Hence, the correct answer is option C.
Discover More from Chapter: Magnetic Properties of Materials
Approach Solution -2
The Correct Answer is (C)
Real Life Applications
- The Curie temperature is important for magnetic materials.
- The Curie temperature is also used in medical imaging, such as magnetic resonance imaging (MRI).
- The Curie temperature is also used in electronics, such as magnetic memory devices.
Question can also be asked as
- Curie temperature is an important feature of which type of materials.
- What is Curie Temperature ?
- How does the Curie temperature affect the behavior of ferromagnetic materials as they are heated or cooled?
- What are the practical implications of the Curie temperature in the design and application of magnetic materials and devices?
Approach Solution -3
The Correct Answer is (C)
Curie's law states that the magnetization of the paramagnetic material is inversely proportional to the absolute temperature of the material. In other words, the magnetic susceptibility of a paramagnetic material is inversely proportional to the absolute temperature of the material.
Curie's Law for Transition from Ferromagnetism to Paramagnetism
In the case of ferromagnetic substances, magnetic susceptibility \(\chi_m\) is related to the absolute temperature T as
\(\chi_m=\frac{C}{T-T_C}\)
Where
- C is Curie's constant
- TC is known as Curie temperature
If the temperature of the ferromagnetic substance is greater than Curie's temperature, then the behavior of the ferromagnetic substance is the same as that of the paramagnetic substance.
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Magnetism & Matter
Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.
Magnetite is the world’s first magnet. This is also called a natural magnet. Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.
Read More: Magnetism and Matter
Some of the properties of the magnetic field lines are:
- The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
- They form closed loops traversing inside the magnet.
- But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
- More number of close lines indicate a stronger magnetic field
- The lines do not intersect each other
- The tangent drawn at the field line gives the direction of the field at that point.