46. Why ferromagnetic substance doesn't lose magnetism in absence of an magnetic field like paramagnetic substances

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Q. Unlike paramagnetic substances, ferromagnetic substances show permanent magnetism even if the external magnetic field is removed.
If true enter 1, else enter 0.

Which of the following statements are correct ?

(a) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic

(b) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic

(c) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other

(d) In ferromagnetic substances, all the domains get oriented in the direction of magnetic filed and remain as such even after removing magnetic field

Q. Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason: Both ferromagnetic and ferromagnetic are strongly attracted by the magnetic field.

Q. A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:

Q. Assertion(A) : The ferro magnetic substances do not obey curie's law.
Reason(R) : At curie point ferromagnetic substances start behaving as a paramagnetic substances.

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