Which one of the following statements best describes magnetic hysteresis?

• Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
• Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
• Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
• Hysteresis is most apparent when the core material is saturated
• None of the above