Magnetic field
A magnetic field was a field in which its particles are charged with electricity, causing them to point to one direction.

This field has the ability to influence materials which were sensitive to magnetism, like magnets or iron. All planets and stars, large or small, have a magnetic field. Its strength depended on the mass and materials of the object.

Naturally-occurring magnetic fields, such as from planets' polar regions, can interfere with sensors and transporters. (; ; ; )

In 2267, the scope of the magnetic effect encountered when Lazarus and  emerged from the alternative warp, was the detection of complete disruption of normal magnetic fields throughout the Milky Way Galaxy and beyond. At the epicenter of the event, the entire magnetic field of the solar system "blinked" out of existence, whereas the mass of the source planet attained zero gravity. ()

During a scan of Aldean DNA, Doctor Beverly Crusher was able to confirm that a failure of the magnetic field of Aldea was not responsible for the Aldeans'  sterility. ()

Lieutenant Jadzia Dax read high magnetic field variations while an energy creation approached the four Deep Space 9 officers trapped inside the Wadi game Chula. ()

Federation runabout hulls were made out of metallic composites which interacted with magnetic fields. In 2369, Chief Miles O'Brien upgraded a probe with a differential magnetometer and was able to detect the missing . ()

Duranium alloy emits a magnetic field that can interfere with sensors. ()

Artificial magnetic fields, better known as electromagnetic fields, can be created and manipulated for a number of uses, including containing antimatter in antimatter containment pods, magnetizing gravity boots, and generating an electromagnetic pulse to jam communications. (; ; Star Trek: The Next Generation Technical Manual)

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Energy fields