NEET 2006 Physics question

Not in JEE Advanced syllabus

Above Curie temperature:-

(1)A ferromagnetic substance becomes paramagneticCorrect
(2)A paramagnetic substance becomes diamagnetic
(3)A diamagnetic substance becomes paramagnetic
(4)A paramagnetic substance becomes ferromagnetic

Answer: (1)

Solution

In a ferromagnetic material the magnetic domains are aligned by strong interaction between neighbouring atomic dipoles. At temperatures above the Curie temperature, thermal agitation destroys this domain alignment and the substance behaves as a paramagnetic material (obeying Curie-Weiss

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Question ID VK-089575