Ncert Exercises & Solutions

Which of the following statements is correct?

I.	Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic
II.	Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic
III.	Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not canceled by each other
IV.	In ferromagnetic substances, all the domains get oriented in the direction of the magnetic field and remain as such even after removing the magnetic field

The correct choice among the given is -

1. (I, II)

2. (II, III)

3. (III, IV)

4. (I, IV)

Hint: Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic

Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic. In ferrimagnetic substances, domains are aligned in the parallel and anti-parallel directions in unequal numbers.

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

Hence, (a) and (d) are correct choices.

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