Answer
Diamagnetism is a property of some materials that causes them to repel magnetic fields. John Tyndall was a physicist who studied diamagnetism and made important contributions to the field. He showed that diamagnetic materials are repelled by magnetic fields, and he also discovered that diamagnetic materials can be used to shield other materials from magnetic fields. Tyndall's work on diamagnetism helped to advance the understanding of magnetism and its applications.