Answer: NIA.
- A NIA
- B NI/A
- C IA/N
- D N/(IA)
Correct answer: A. NIA
Explanation: Magnetic moment m = NIA, directed normal to the coil plane.
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.