An electromagnetic field, also known as an EM field, was an energy field created by the interaction of electricity and magnetism.

Pulsars had electromagnetic fields. (TOS novelization: The Wrath of Khan)

In 2266, the USS Enterprise became trapped in an "electronic field" (also referred to as a force field) surrounding an asteroid in the Nabu system; a landing party was sent to the asteroid to find the field's power source. However, Spock discovered a way to break free of the field using counter energy. (TOS comic: "The Devil's Isle of Space")

The spacecraft used by the Unoite leaders Justin I and Justin II generated an electronic field which prevented an Enterprise landing party from beaming away. Spock disabled the field by firing his phaser at the craft. (TOS comic: "The Ghost Planet")

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