Question:
Curie-Weiss law is obeyed by iron
Curie-Weiss law is obeyed by iron
Updated On: Mar 5, 2024
- at Curie temperature only
- at all temperatures
- below Curie temperature
- above Curie temperature
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The Correct Option is D
Solution and Explanation
Iron is a ferromagnetic substance. The Curie point for iron is $1043\, K \left(=770^{\circ} C \right)$. If the temperature of a ferromagnetic material is raised above a certain critical value called the Curie temperature the exchange coupling ceases to be effective. Most such materials then become paramagnetic. Also after Curie point, susceptibility of a ferromagnetic substance varies inversely with its absolute temperature. Hence, a ferromagnetic substance obeys Curie-Weiss law above its Curie temperature.
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Concepts Used:
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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.
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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.