Magnetism Overview Quiz

The force of attraction or repulsion between materials.

Materials that respond to magnetic fields.

The structure of an atom that impacts its magnetic properties.

Magnet created by electric current.

Material that retains magnetism.

Material that easily magnetizes and demagnetizes.

Uses of magnetism in various technologies.

Iron oxide known for its strong magnetism

The magnetic moment associated with electron's orbital angular momentum.

µl = -gl√l(l+1)µB

A fundamental unit of magnetic moment.

Magnetic moment due to electron's intrinsic spin.

µs = -gs(s+1)µB/2

Materials repelled by magnetic fields.

Caused by the change in orbital motion of electrons due to external magnetic field, creating small opposing magnetic dipoles.

Examples include Zinc, Bismuth, Sodium Chloride, and Gold.

The ability of a magnetic material to retain a certain amount of residual magnetism after the magnetizing force is removed.

The strength of the reverse magnetic field needed to completely demagnetize a material.

A measure of how easily a magnetic field can be established within a material.

A graph showing the relationship between the magnetizing force (H) and the magnetic flux density (B) in a ferromagnetic material.

The loss of energy that occurs during the magnetization and demagnetization of a ferromagnetic material due to domain wall movement and dipole rotation.

The movement of boundaries between magnetic domains within a material, causing changes in magnetization.

The rotation of magnetic dipoles within a material, aligning them with the applied magnetic field.

The hysteresis loop provides crucial information about the magnetic properties of a material, including its retentivity, coercive force, and permeability.

Materials that are difficult to magnetize and demagnetize. They have a large hysteresis loop area, high coercivity, and high retentivity.

The strength of the magnetic field required to demagnetize a material.

A measure of how easily a material can be magnetized.

Substances that exhibit strong magnetism due to the alignment of their magnetic domains. They retain their magnetization even after the external magnetic field is removed.

Small regions within a ferromagnetic material where magnetic moments of atoms are aligned, resulting in a net magnetic moment for the domain.

Boundaries between magnetic domains in a ferromagnetic material, where the orientation of magnetic moments changes.

When an external magnetic field is applied, the domains can rotate their orientation and increase in size, aligning themselves with the applied field, leading to a strong magnetization.

In an unmagnetized material, the domains are randomly oriented, resulting in a cancellation of net magnetization, making the material appear non-magnetic.

Ferromagnetic materials have a much stronger magnetic susceptibility than paramagnetic materials, meaning they are much more easily magnetized.

Ferromagnetic materials are attracted towards the stronger part of a non-uniform magnetic field.

Ferromagnetic materials are crucial for various technologies, such as electric motors, generators, and data storage devices, due to their ability to be easily magnetized and demagnetized.

A negative value indicating the extent to which a diamagnetic material is repelled by a magnetic field.

The ratio of the magnetic permeability of a material to the permeability of a vacuum, slightly less than unity for diamagnetic materials.

A phenomenon where materials are weakly attracted to magnetic fields due to unpaired electrons that align with the field.

A law describing the relationship between magnetic susceptibility (χ) and temperature (T) for paramagnetic materials.

A phenomenon where materials exhibit strong and permanent magnetic moments due to aligned electron spins.

A quantum mechanical interaction that aligns the electron spins in ferromagnetic materials, creating strong permanent magnetic moments.

Diamagnetism is the weak repulsion of a material by a magnetic field due to induced opposing dipoles, while paramagnetism is the weak attraction due to unpaired electron alignment.