Back in 1836 a British scientist Michael Faraday had a very interesting and informative experience.Under his direction, a large wooden cage plastered with sheets of tin paper (foil).It was then isolated from the earth's surface and highly charged with an electric machine.The potential difference of this design with the earth was so strong that at the approach of her body, connected to the earth's surface, with its outer surface sparks.It is not surprising that the Faraday cage Many witnesses awe-inspiring.Sam English physicist was within its structure, holding a very sensitive electroscope.
which allowed to find Faraday cage?
During the test, the unit is fully serviceable in the hands of physics showed a complete absence of electrical charge.This means that such construction can be effectively used as the boundary shields.Later we found out that the ability of the screen to neutralize electromagnetic radiation depends on the thickness of its material, the depth of the effect of the surface and the aspect ratio of the openings to the length of wave action.Thus, the experiments of Faraday allowed people to find a way to protect sensitive equipment and human health from the harmful effects of a powerful electromagnetic field.This property is widely used in practice, and it is difficult to imagine what would happen to humanity if it were not for the ingenuity and courage of the brave physicist.
How does Faraday cage?
when closed electrically conductive sheath enters the electric field, it begins to affect the free electrons, resulting in the opposite sides of this design acquires a charge, creating in turn a field is fully compensated external influence.It should be noted that Faraday cage can protect only the electric field.A magnetic field, provided that it is static, freely penetrates.Therefore, within the compass of this design will work correctly.In the case of the dynamic electric field occurs in the following thing: it creates a dynamic magnetic field that, according to the laws of physics, generate their varying electric field, preventing the creation of a magnetic field within this screen.
Modern Faraday cage
now open English physicist phenomenon is used for mobile booths, shielded rooms, RF boxes.Such facilities are widely used wherever necessary to protect man from the electric field.As the electrically conductive material is now commonly used small metal mesh or perforated sheet steel construction and themselves necessarily grounded to dissipate any electrical currents that may arise from external radiation.
In addition, a Faraday cage is widely used to test all kinds of computer equipment, electronic components and so on. D. There are even special individual screening kits, and some companies offer greater security for people to escape their apartments.
