They are also used to protect people and equipment against actual electric currents such as lightning strikes and electrostatic discharges, since the enclosing cage conducts current around the outside of the enclosed space and none passes through the interior.įaraday cages cannot block stable or slowly varying magnetic fields, such as the Earth's magnetic field (a compass will still work inside). This phenomenon is used to protect sensitive electronic equipment (for example RF receivers) from external radio frequency interference (RFI) often during testing or alignment of the device.
Video of a Faraday cage shielding a man from electricityĪ Faraday cage operates because an external electrical field causes the electric charges within the cage's conducting material to be distributed so that they cancel the field's effect in the cage's interior. Faraday cages are named after scientist Michael Faraday, who invented them in 1836. A Faraday shield may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. They are typically used to block remote wiping or alteration of wireless devices recovered in criminal investigations, but may also be used by the general public to protect against data theft or to enhance digital privacy.Ī Faraday cage or Faraday shield is an enclosure used to block electromagnetic fields. Enclosure of conductive mesh used to block electric fields Faraday cage demonstration on volunteers in the Palais de la Découverte in Paris EMI shielding around an MRI machine room Faraday shield at a power plant in Heimbach, Germany Faraday bags are a type of Faraday cage made of flexible metallic fabric.
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