Electromagnetic wave in a conductor

AI Thread Summary
When an electromagnetic wave encounters a conductor, the wave's transmitted portion is significantly damped due to the behavior of free electrons within the material. The electric field inside the conductor is effectively zero, as free electrons redistribute to cancel the applied field. Although the electrons are not entirely free, they can move enough to generate a current, which leads to heating in the conductor. The attenuation of the electromagnetic wave is not instantaneous, as the rate of change of the electric field is finite. Understanding these principles clarifies why electromagnetic fields are diminished inside conductive materials.
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When an electromagnetic wave hits a conductor the transmitted part of the wave is damped considerably. I want to know if anyone can explain physically why the field is attentuated inside the conductor - i.e. what happens.
I know the basic properties of a conductor:
- Electrons free to roam
- E-field 0 inside it
- Net charge resides on surface
But can't really combine this to a clear understanding.
 
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aaaa202 said:
When an electromagnetic wave hits a conductor the transmitted part of the wave is damped considerably. I want to know if anyone can explain physically why the field is attentuated inside the conductor - i.e. what happens.
I know the basic properties of a conductor:
- Electrons free to roam
- E-field 0 inside it
- Net charge resides on surface
But can't really combine this to a clear understanding.

The electrons are not completely free in most conductors (except super conductors ). If the electrons were completely free in metals incandescent electric lights would not work. A current that is passed through a conductor heats it.

The electric field dies off rapidly inside a conductor but the change is not infinite, dE/dx ≠ ∞
 
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