Electromagnetism
An electric force between two charged objects gets stronger the more charge each object has and the closer together they are, and depending on the charges involved, it can either pull the objects together or push them apart. Running an electric current through a coiled wire creates a magnetic field, called an electromagnet, and the strength of that magnetic field depends on factors like how much current flows and how many times the wire is coiled. Electric motors and generators both rely on this connection between electricity and magnetism to work.
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