A perfect conductor or perfect electric conductor (PEC) is an idealized material exhibiting infinite electrical conductivity or, equivalently, zero resistivity (cf. perfect dielectric). While perfect electrical conductors do not exist in nature, the concept is a useful model when electrical resistance is negligible compared to other effects. One e...
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http://en.wikipedia.org/wiki/Perfect_conductor
a hypothetical medium such that an external variable electric field would produce on its surface an electrical current density vector which would be tangential to the surface and arbitrarily large in a particular frequency band NOTE - It is possible for an anisotropic medium to be a perfect conductor in certain directions only; in these directions ...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-03-10
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