Answer: 1.5.
- A 0.5
- B 0.75
- C 1.5
- D 2.5
Correct answer: C. 1.5
Explanation: μ_r = 1 + χ = 1 + 0.5 = 1.5.
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.