What defines the phenomenon of loss of magnetism in a material due to reversed H field strength?

The phenomenon of loss of magnetism in a material when exposed to a reversed H field strength is defined by coercive force. Coercive force is the measure of the ability of a magnetic material to withstand an external magnetic field that tends to demagnetize it. When the external magnetic field is reversed, the coercive force represents the intensity of the magnetic field required to reduce the magnetization of the material to zero.

In ferromagnetic materials, when a magnetic field is applied, they become magnetized. However, if the direction of the applied field is reversed, the coercive force indicates how much the field strength must be increased in the opposite direction to effectively demagnetize the material. A high coercive force means that the material is resistant to becoming demagnetized, whereas a low coercive force indicates that the material can easily lose its magnetism under a reversed field.

The other choices do not specifically describe this phenomenon. Residual magnetism refers to the magnetism that remains in a material after the external magnetizing field has been removed, saturation level relates to the maximum magnetization a material can reach under a magnetic field, and flux leakage is a term associated with the loss of magnetic flux due to circuit configurations and is not directly related