Assertion : On heating ferromagnetic or ferromagnetic substance , they become paramagnetic
Reason :The electrons change their spin on heating

Explain ferromagnetic and diamagnetic substances.

What are the ferromagnetic Substances ?

Temperature above which a ferromagnetic substance becomes paremagnetic is called

Mark the correct set of ferromagnetic substances

On heating a ferromagnetic substance above curie temperature

NiO is antiferromagnetic. But on heating at 250°C , it becomes paramagnetic. Why?

Assertion (A) : Antiferromagnetic substances on heating to high temperature become paramagnetic. Reason (R ) : On heating, the randomization of spins occurs.

Assertion : The properties of paramagnetic and ferromagnetic substance are not effected by heating. Reason : As temperature rises, the alignment of molecular magnets gradually decreases.

A ferromagnetic substance becomes the permanent magnet when it is placed in the magnetic field because