Answer: bar magnet.
- A bar magnet
- B capacitor
- C resistor
- D battery
Correct answer: A. bar magnet
Explanation: The Earth acts like a huge bar magnet tilted slightly from its rotation axis.
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.