Magnetic Fields & Materials

What are the two main types of magnetic materials?

• diamagnetic and antiferromagnetic

• paramagnetic and diamagnetic

• ferromagnetic and antiferromagnetic

• ferromagnetic and paramagnetic

What is the Curie temperature of ferromagnetic materials?

• Always below freezing temperatures

• Exactly 100 degrees Celsius

• Depends on the specific material, typically ranging from a few hundred to a few thousand degrees Celsius.

• Varies based on the day of the week

Which type of magnetic material retains its magnetism after the magnetic field is removed?

• Reversible magnet

• Permanent magnet

• Semi-permanent magnet

• Temporary magnet

Name a common example of a ferrimagnetic material.

• Chromite (FeCr2O4)

• Hematite (Fe2O3)

• Pyrrhotite (Fe1-xS)

• Magnetite (Fe3O4)

What is the difference between diamagnetic and paramagnetic materials?

• Diamagnetic materials have all paired electrons, while paramagnetic materials have unpaired electrons.

• Diamagnetic materials are only found in nature, while paramagnetic materials are man-made.

• Diamagnetic materials have unpaired electrons, while paramagnetic materials have all paired electrons.

• Diamagnetic materials attract magnetic fields, while paramagnetic materials repel them.

How do antiferromagnetic materials align their magnetic moments?

• Antiferromagnetic materials do not have magnetic moments

• Neighboring magnetic moments point in opposite directions

• Magnetic moments align randomly in antiferromagnetic materials

• Neighboring magnetic moments point in the same direction

What is the role of domains in ferromagnetic materials?

• Domains in ferromagnetic materials are used for sound amplification.

• Domains in ferromagnetic materials help in aligning the magnetic moments of atoms or ions, leading to the material's magnetic properties.

• Domains in ferromagnetic materials are responsible for electrical conductivity.

• Domains in ferromagnetic materials cause the material to become transparent.

How does the magnetic permeability of paramagnetic materials change with temperature?

• Decreases

• Remains constant

• Increases

• Fluctuates