Answer: hard magnetic, like steel.
- A hard magnetic, like steel
- B soft magnetic material
- C a diamagnetic one
- D a paramagnetic one
Correct answer: A. hard magnetic, like steel
Explanation: Hard magnetic materials (e.g. steel) retain magnetism and are used for permanent magnets.
Magnetic field lines form closed loops: outside the bar magnet they run from the N pole to the S pole; inside, they continue from S back to N, so the lines never start or end anywhere.
Concept context
Bar magnets, Earth's magnetism, and how different materials respond to an external magnetic field - diamagnetic, paramagnetic, and ferromagnetic behaviour.