Answer: ampere-metre (A·m).
- A ampere-metre (A·m)
- B the tesla unit (T)
- C the weber unit (Wb)
- D the henry unit (H)
Correct answer: A. ampere-metre (A·m)
Explanation: Pole strength is measured in ampere-metre (A·m).
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.