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An Electromagnetic field is an energy field produced by electrically charged objects that affects the behavior of charged objects in the vicinity of the field. A field of this nature is able to disrupt the normal operations of both computerized or mechanical technology and living beings.
On the planet M7G-677, a Zero Point Module powers a device which acts as a sort of an electromagnetic field which disables all electrical devices within the radius, including those of the Wraith and the Atlantians. (SGA: "Childhood's End")