What type of loss occurs from the energy expended in continually magnetizing and demagnetizing core material?

The correct answer is hysteresis loss, which occurs due to the energy expended as the magnetic material in a core is magnetized and demagnetized repeatedly during normal operation.

When an alternating current passes through a coil wound around a magnetic core, the magnetic field produced causes the core material to be magnetized in one direction and then demagnetized as the current reverses. This process is not perfectly efficient; some energy is lost in the form of heat due to the internal friction of the magnetic domains realigning with the changing magnetic field. This phenomenon is referred to as hysteresis loss and is particularly significant in materials like iron that have specific magnetic properties.

Other options refer to different types of losses. Eddy loss relates to current loops induced in conductors as they pass through a changing magnetic field, leading to energy dissipation. Copper loss arises from the resistance to current flow in the wires, resulting in heat production. Voltage loss typically refers to the reduction of voltage levels due to resistance in a circuit and is not directly related to the magnetization processes in cores. Hysteresis loss, however, specifically addresses the energy loss due to the magnetization cycle, making it the correct choice.