Understanding EM Wave Attenuation in Conductors and Dielectrics

AI Thread Summary
EM waves attenuate in conductors due to energy loss, while dielectrics exhibit minimal attenuation. The impedance of a dielectric does not primarily indicate energy loss, as absorption is significantly lower than in metals. In many scenarios, the imaginary part of the permittivity (Im{ε}) of a dielectric can be considered negligible. Understanding these differences is crucial for applications involving electromagnetic wave propagation. Overall, the behavior of EM waves in conductors and dielectrics highlights their distinct electrical properties.
silence98
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Hi, I have been reading my textbook and online but I'm not sure if I understand. An EM wave attenuates in a conductor but not in a dielectric? If that is correct what does the impedance of a dielectric represent, since I thought impedance would be associated with an energy loss...
 
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The absorpion in a dielectric is less than that in a metal. In many cases you can safely neglect the Im{ε} of a dielectric.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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