Answer: horizontal.
- A horizontal
- B purely vertical
- C diagonal
- D radial
Correct answer: A. horizontal
Explanation: The horizontal component, along with declination and dip, fully specifies the Earth’s field at a place.
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.