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.
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.
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The Correct Answer is (C)
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.
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
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.
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : If oxygen ion (O\(^{-2}\)) and Hydrogen ion (H\(^{+}\)) enter normal to the magnetic field with equal momentum, then the path of O\(^{-2}\) ion has a smaller curvature than that of H\(^{+}\).
Reason R : A proton with same linear momentum as an electron will form a path of smaller radius of curvature on entering a uniform magnetic field perpendicularly.
In the light of the above statements, choose the correct answer from the options given below
Two point charges M and N having charges +q and -q respectively are placed at a distance apart. Force acting between them is F. If 30% of charge of N is transferred to M, then the force between the charges becomes:
If the ratio of lengths, radii and Young's Moduli of steel and brass wires in the figure are $ a $, $ b $, and $ c $ respectively, then the corresponding ratio of increase in their lengths would be:
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