Answer: Poles always come in pairs (no monopoles).
- A North pole, which can exist in isolation under strong fields
- B South pole, which can be isolated by cutting a magnet
- C Monopole (they do exist)
- D Poles always come in pairs (no monopoles)
Correct answer: D. Poles always come in pairs (no monopoles)
Explanation: Magnetic monopoles do not exist. Every magnet always has a north AND south pole. Cut a magnet and two smaller magnets form.
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.