Answer: declination.
- A declination
- B the dip angle
- C the incidence
- D the refraction
Correct answer: A. declination
Explanation: Declination is the horizontal angle between true (geographic) north and magnetic north.
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.