Answer: 1.198 × 10⁶ A/m.
- A 2000 A/m
- B 1.198 × 10⁶ A/m
- C 599 A/m
- D 1.2 × 10³ A/m
Correct answer: B. 1.198 × 10⁶ A/m
Explanation: H = nI = 1000 × 2 = 2000 A/m, and magnetisation M = χH = 599 × 2000 ≈ 1.198 × 10⁶ A/m, illustrating the very large magnetisation typical of ferromagnetic cores.
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.