What Is a Magnetic Field?

By jamie

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2. Special Relativity

Electro magnets work thanks to special relativity as was described by none other than Alfred Einstein. Usually, the positively charged protons and the negatively charged electrons in a wire will cancel each other out. This all changes when an electric charge is passed through the wire, however, because the electrons then start moving.

The theory of relativity means that because the electrons are moving in relation to the protons, the distance between each of the electrons decreases to anything that is outside of the wire. With more negatively charged electrons, the wire becomes electrically charged, and the wire becomes magnetized.

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