Diamagnetism is a form of magnetism that occurs in materials that do not have a net magnetic moment and are characterized by a very weak repulsion from an external magnetic field. This property arises due to the change in the motion of electrons when exposed to a magnetic field, leading to the creation of small induced magnetic fields that oppose the external field. Diamagnetic materials are typically characterized by negative magnetic susceptibility, which signifies their tendency to be repelled by magnetic fields.
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