Answer: 300.
- A 150
- B 300
- C 600
- D 800
Correct answer: B. 300
Explanation: χ = M/H = (2.4 × 10<sup>5</sup>)/800 = 300.
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.