<p dir="ltr"><img src="https://d2vlcm61l7u1fs.cloudfront.net/media%2F86d%2F86de8d3e-c87c-4491-86b3-0df80132b35b%2Fimage" alt="Electromagnetism Given a linear medium with frequency independent conductivity ? and permittivity . Suppose that the electric field E varies harmonically with frequency w, i.e. the field