Diamagnetism is a property of certain materials that causes them to create a weak magnetic field in the opposite direction when placed in an external magnetic field. This effect is very small and is only present when the material is exposed to a magnetic field.
Yes, diamagnetism is only present when the material is exposed to a varying magnetic field. In the absence of a magnetic field, diamagnetic materials do not exhibit any magnetic properties.
Diamagnetism is the weakest form of magnetism and is present in all materials to some degree. Paramagnetism is a stronger form of magnetism, where materials are weakly attracted to a magnetic field. Ferromagnetism is the strongest form of magnetism, where materials can become permanently magnetized.
All materials exhibit some degree of diamagnetism, but it is usually very weak. Some common examples of diamagnetic materials include water, copper, gold, and silver.
Diamagnetism is often used in scientific research to study the properties of materials. By measuring the strength of the diamagnetic effect, scientists can gather information about the electronic and magnetic properties of a material. It is also used in fields such as magnetic levitation and magnetic resonance imaging (MRI).