what happens wen an electromagnetic wave travels tru a conducting medium?

Answer 1

An electric current will be induced in the conducting medium. The same thing would happen if the electromagnetic field was stationary with the conducting medium moved through it. It's this interaction that's at the basis of electric generators and motors.

Answer 2

The answer can be found by solving Maxwell's Equations for the specific situation. It takes years of study and practice to become competent at doing this. The electric field component (combined with the electric field due to static charges) causes current to flow in the medium, moving the otherwise static charges and generating a magnetic field, which interacts with the magnetic field component of the wave. This changing magnetic field induces a current in the medium, which combines with the current due to the electric field. The less uniform the medium, the harder to solve the equations.

Answer 3

The second answer is closer to the truth; the first answer deals with static fields, not changing ones. Silverware is shiny because the metal is a good conductor of electricity, so incident waves travel only a very small distance into the metal before being reflected.

Answer 4

Long and medium waves are reflected from the metals and ionosphere where free charges are there. They do not penetrate.

Short waves and uhf pass through unimpeded.

For optical region the behavior is different.

Answer 5

Hardly penetration; strong reflection.
The wave will be absorbed and transformed to heat.
(Think about the microwave in the kitchen)

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