Magnetism
Magnetism
Magnetism (/mæɡˈnɛtɪzəm/; from Greek: μαγνητισμός, magnetismos) is a class of physical phenomena that are mediated by magnetic fields. Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts on other currents and magnetic moments.
Etymology
The word "magnetism" is derived from the Greek word "magnētis lithos", which means "magnesian stone", a type of iron ore. The ancient Greeks noticed that this substance attracted other things to it, and thus the concept of magnetism was born.
Related Terms
- Magnetic Field: A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
- Magnetization: Magnetization is the measure of the density of aligned magnetic moments in a magnetic material.
- Diamagnetism: Diamagnetism is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism, the material is called a diamagnet.
- Paramagnetism: Paramagnetism is a form of magnetism whereby some materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field.
- Ferromagnetism: Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
See Also
External links
- Medical encyclopedia article on Magnetism
- Wikipedia's article - Magnetism
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