It turns out that if you apply relativity to the movement of electrons, you can prove that electricity and magnetism are the same thing. They behave different most of the time, but for some situations they are truly one force, called electromagnetism.
Electromagnetism is a force, which is generated when charged particles move. Charged particles generate an electric field, and if they move, they will generate a magnetic field. We’ll often consider the two fields together and call it an electromagnetic field.
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