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a
Ferro magnetic becomes diamagnetic material
b
Par magnetic material becomes diamagnetic material
c
Ferro magnetic material becomes paramagnetic material
d
Para magnetic becomes ferromagnetic material
answer is C.
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Detailed Solution
At Curie temperature magnetic susceptibility decreases with increase of temperature and Ferromagnetic substance converts into para magnetic substanceHence key (3) is correct, (2), (1) and (4) are not correct