Which term describes the force required to remove magnetism from a material?

The term that describes the force required to remove magnetism from a material is coercive force. This force is an important property of magnetic materials, particularly in the study of how they maintain or lose their magnetic properties. Coercive force reflects the intensity of the external magnetic field needed to demagnetize a magnetized material.

When a magnetic material is magnetized, it can retain a certain amount of magnetism even after the external magnetic field is removed, which is captured by the concept of residual magnetism. However, coercive force specifically refers to the energy or force required to overcome this residual magnetism and effectively demagnetize the material.

Saturation refers to the state in which an increase in the external magnetic field does not increase the magnetization of the material further. Magnetic permeability is a measure of how easily a material can be magnetized or how well it can support the formation of a magnetic field within itself. Therefore, while these terms relate to magnetic properties, they do not describe the specific force needed for demagnetization as coercive force does.