Answer: It decreases.
- A It increases
- B It decreases
- C It stays constant
- D It becomes negative
Correct answer: B. It decreases
Explanation: Paramagnetic susceptibility decreases as temperature increases, since greater thermal agitation disrupts the alignment of atomic magnetic dipoles with the external field. Diamagnetic susceptibility, by contrast, is essentially independent of temperature.
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.