MHT CET 2024 Physics question

Not in JEE Advanced syllabus

A ferromagnetic material is heated above its curie temperature. The correct statement from the following is that

(A)ferromagnetic domains are perfectly arranged
(B)ferromagnetic domains become randomCorrect
(C)ferromagnetic domains are not influenced
(D)ferromagnetic material changes itself into diamagnetic material

Answer: (B)

Solution

Above the Curie temperature the thermal agitation of the atomic magnetic moments overcomes the exchange coupling that keeps them aligned inside a domain. The domain structure is destroyed, the moments point randomly, and the net magnetisation vanishes, so the material behaves as a paramagnetic substance. Hence the

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Question ID VK-092555