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◉ Science·2 min·Updated Mar 14, 2026

What is Diamagnetism?

Diamagnetism

Quick Answer

This is a property of materials that causes them to be repelled by a magnetic field. Diamagnetic materials create a weak magnetic field in opposition to an applied magnetic field, making them slightly push away from it.

Overview

Diamagnetism is a fundamental property of certain materials that makes them repel magnetic fields. When exposed to a magnetic field, these materials generate a weak magnetic field in the opposite direction. This occurs because the electrons in the atoms of diamagnetic materials adjust their orbits in response to the external magnetic field, creating a small opposing force. Most materials exhibit some degree of diamagnetism, but it is typically very weak and overshadowed by stronger magnetic effects in ferromagnetic or paramagnetic materials. A classic example of diamagnetism can be seen with bismuth, which is known for its strong diamagnetic properties. When placed in a magnetic field, bismuth will be repelled, demonstrating how diamagnetism can be a noticeable effect in certain situations. Understanding diamagnetism is important in physics as it helps scientists explore and manipulate magnetic fields in various applications. For instance, it plays a role in magnetic levitation, where small objects can be suspended in the air using strong magnetic fields. This principle is not only fascinating but also has practical uses in technologies like magnetic bearings and contactless transportation.

Frequently Asked Questions

Many materials are diamagnetic, including bismuth, copper, and graphite. Almost all substances show some level of diamagnetism, but it is often weak and not easily noticeable.
Diamagnetism is a very weak form of magnetism compared to ferromagnetism and paramagnetism. While ferromagnetic materials can become strongly magnetized and retain their magnetism, diamagnetic materials do not retain magnetization once the external field is removed.
Yes, diamagnetism has practical applications, such as in magnetic levitation. This technology allows objects to float above a magnetic surface, which is used in high-speed trains and other innovative transport systems.