What is a characteristic of diamagnetic materials?

• A. They exhibit permanent magnetism.
• B. They have small negative magnetic susceptibility.
• C. They can be easily magnetized.
• D. They can remain magnetized indefinitely.

Answer: (B)

Diamagnetic materials are characterized by their small negative magnetic susceptibility, which means they are weakly repelled by a magnetic field. This property arises from the orientation of electron spins within the material. In diamagnetic substances, the electrons are paired, and their magnetic moments cancel each other out, resulting in a net magnetic moment of zero in the absence of an external magnetic field. When exposed to a magnetic field, these materials experience a very slight repulsion, which is the basis for the measured negative magnetic susceptibility.

The other characteristics mentioned, such as permanent magnetism, ease of magnetization, and the ability to remain magnetized indefinitely, pertain to different types of materials. Ferromagnetic materials, for instance, exhibit permanent magnetism and can be easily magnetized, while permanent magnets retain their magnetization over time. In contrast, diamagnetic materials do not retain any magnetism when the external magnetic field is removed, emphasizing their unique property of weak repulsion rather than attraction or retention of magnetic properties.