What is the term for the amount of magnetism left in an electromagnet after the current has been removed?

The term for the amount of magnetism that remains in an electromagnet after the current has been removed is known as residual magnetism. This phenomenon occurs because certain materials used in the construction of electromagnets, typically ferromagnetic materials, have the ability to retain some magnetism even when the external magnetic field (created by the electric current) is no longer present. This residual magnetism is a result of the alignment of the magnetic domains within the material and can be significant in practical applications where the performance of the electromagnet needs to be evaluated after deactivation.

Induced magnetism refers to the temporary magnetism generated in ferromagnetic materials when exposed to an external magnetic field, but does not persist once the external field is removed. Permanent magnetism relates to materials that have a stable magnetic field without the need for an external current, while temporary magnetism typically describes the behavior of materials that exhibit magnetism in the presence of an external field but lose it quickly after removal. Each of these terms describes different aspects of magnetism, but it's residual magnetism that specifically refers to the remaining magnetism after an electromagnet is powered down.