Answer: magnetic field.
- A magnetic field
- B electric field
- C gravitational field
- D null region
Correct answer: A. magnetic field
Explanation: The magnetic field is the region where a magnetic force acts on other magnets or currents.
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.