Faraday Cage has become a contetious topic after being asked in the recent AIIMS exam. Here is a brief explanation.
Mu-copper foil for electro-magnetic shielding of rooms, buildings, tempest applications computer-rooms, EMC-test-sites, susceptibility measurements hospitals, MRI rooms, anechoic chambers, shielded enclosures, faraday chambers, and other EMI/RFI appliances. With this material, which can be applied as wallpaper, an existing room can be transformed easily into a Faraday-cage with an attenuation level of 40 to 80 dB. For magnetic shielding, monitor protection and shielding of transformers and cable-trunks