kelvin490 said:Why don't these materials keep on repelled by a magnet? (e.g. we do see copper is repelled and fly away from a magnet)
Diamagnetic materials are not repelled by magnets because they possess no permanent magnetic dipole moment. This means that the individual atoms in a diamagnetic material have no net magnetic field and therefore cannot be affected by an external magnetic field.
Diamagnetic materials interact with magnetic fields in a different way than ferromagnetic or paramagnetic materials. When exposed to a magnetic field, the electrons in a diamagnetic material will create a small current that opposes the external field. This results in a very weak repulsive force that is often not noticeable.
No, diamagnetic materials cannot be magnetized. Unlike ferromagnetic or paramagnetic materials, which have their own magnetic fields that align with an external magnetic field, diamagnetic materials have no inherent magnetic properties. Therefore, they cannot be magnetized.
Some common examples of diamagnetic materials include gold, silver, copper, water, and most organic compounds. These materials are not attracted to magnets and will experience a weak repulsive force when exposed to a magnetic field.
Diamagnetic materials are used in a variety of everyday applications. For example, they are commonly used in MRI machines to create images of the body. They are also used in maglev trains, which use the repulsive force between magnets and diamagnetic materials to levitate and propel the train forward. Additionally, diamagnetic materials are used in some types of levitating toys and experiments, as well as in some types of electronic devices.