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Detailed guide to the complex subject of Electromagnetic fields (EMFs).An EMF (which stands for "Electromagnetic Field") is a field of energy created by electrically charged objects. An electromagnetic field has two "components", a magnetic component and an electric component. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents). Electromagnetic fields are also often referred to as "Electromagnetic Radiation" (EMR). You can't see, feel or hear electromagnetic fields, apart from visible light, which is a part of the electromagnetic spectrum.