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 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.