What is ferrimagnetism? 

Ferrimagnetism is in

What are paramagnetisma and ferromagnetism ? What type of substances would make batter permanent magnets, ferromagnetic or ferrimagnetic?

Explain the following with suitable examples: a. Ferromagnetism b. Paramagnetism c. Ferrimagnetism

which of the following statements are correct ? (a)Ferrimagnetic substance lose ferrimagnetism on heating and become paramagnetic (b)Ferrimagnetic substance do not lose ferrimagnetism on heating and Remain ferromagnetic (c)Antiferromgnetic substance have domain structures similar to ferromagnetic substance and their magnetic moment are not cancelled by each other (d)Antiferromagnetic substance have domain structures similar to ferromagnetic substance and their magnetic moment are not cancelled by each other

Example the following with suitable examples: a. Ferromagnetism b. Paramagnetism c. Ferrimagnetism d. Antiferromagnetism e. 12 - 46 and 13 - 15 group compounds

Assertion:Substances like Fe_3O_4 and MgFe_2O_4 lose ferrimagnetism on heating and become paramagnetic Reason : Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

Ferrimagnetism is in:

Define the following terms " (i) n-type semiconductor. (ii) Ferrimagnetism.

Define the terms (i) F-centres (ii) n-type semi-conductors (iii) Ferrimagnetism.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic? Justify your answer.