Answer: magnetic poles.
- A magnetic poles
- B magnetic equator
- C surface everywhere
- D geometric centre
Correct answer: A. magnetic poles
Explanation: At the magnetic poles the field is vertical, so the angle of dip is 90°.
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.