Ferromagnetic and ferrimagnetic substances Magnetic Power

The video tutorial explains different types of magnetic substances: ferromagnetic, antiferromagnetic, and ferrimagnetic. Ferromagnetic substances, like iron, cobalt, and nickel, exhibit permanent magnetism. Antiferromagnetic substances have equal parallel and anti-parallel magnetic moments, resulting in no net magnetism. Examples include manganese dioxide and ferric oxide. Ferrimagnetic substances have unequal magnetic moments, leading to a net magnetic moment, as seen in magnetite and ferrite. Heating can convert ferromagnetic and ferrimagnetic substances into paramagnetic substances.

Which of the following metals is known for exhibiting ferromagnetism?

• Iron

• Copper

• Silver

• Aluminum

What is the net magnetic moment in antiferromagnetic substances?

• Positive

• Negative

• Zero

• Variable

Which of the following is an example of an antiferromagnetic substance?

• Magnetite

• Manganese dioxide

• Nickel

• Cobalt

In ferrimagnetic substances, what is the relationship between parallel and antiparallel magnetic moments?

• They are random

• They are equal

• Antiparallel moments are greater

• Parallel moments are greater

What happens to ferromagnetic or ferrimagnetic substances when they are heated?

• They become more magnetic

• They lose all magnetism

• They turn into paramagnetic substances

• They become superconductors