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 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.