Faraday Cage

A Faraday cage is an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within a conductor is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives pass harmlessly around the outside of the cage. Immediately after an external electric field is applied, the electrical charges inside the cage walls are rearranged in the way depicted in the lower image since opposite electrical charges attract each other. As a result, another electrical field is created between the cage walls in the opposite direction to the original field and with equal magnitude. These two fields are cancelling each other. The electrical charge inside the cage would remain zero. The Faraday cage is used to prevent the passage of electromagnetic waves and electric fields, either containing them in or excluding them from its interior space. The Faraday cage can be represented by real structures like cars or airplanes. If lightning hits them, it does not affect the people sitting inside.