Shielded room - Faraday cage
Faraday cage is a concept introduced in the 19th century. It is based on a principle that the electric charge is concentrated only on the outside surface and not in the volume of a conductor. This means that no electric field is produced inside.
Shielded room (Faraday cage) is used particularly where it is required to protect equipment or persons against the harmful effect of electromagnetic field, radio waves, etc. For this purpose it is therefore required to build specialised Faraday cages. One type of a Faraday cage is to a certain degree a motorcar. Motorcar can, for example, protect persons inside against the effects of lightning striking the motorcar because the electric charge and, hence, the electric current is conducted through the body of the motorcar and, therefore, not through the body of the persons inside. Faraday cage can also be the metal casing of electroacoustic devices or the shielding of cables.
