Answer: easily magnetised and demagnetised.
- A easily magnetised and demagnetised
- B able to retain magnetism forever
- C impossible to magnetise
- D strongly diamagnetic
Correct answer: A. easily magnetised and demagnetised
Explanation: Soft iron magnetises and demagnetises readily, ideal for temporary electromagnets.
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.