Answer: much greater than 1.
- A much greater than 1
- B much less than 1
- C exactly equal to 1
- D exactly zero
Correct answer: A. much greater than 1
Explanation: Ferromagnets have relative permeability far greater than 1 (hundreds to thousands).
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.