Answer: magnetisation.
- A magnetisation
- B temperature
- C electric current
- D applied voltage
Correct answer: A. magnetisation
Explanation: In a hysteresis loop, the magnetisation lags the applied field, and the loop area represents energy lost per cycle.
Magnetic field of a bar magnet: field lines emerge from the north pole and re-enter at the south pole outside the magnet, forming continuous closed loops. Image: Geek3, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Bar magnets, Earth's magnetism, and how different materials respond to an external magnetic field - diamagnetic, paramagnetic, and ferromagnetic behaviour.