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Physics
Classical Physics
Electromagnetism
Surface charge of neutral solids
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[QUOTE="tech99, post: 6873106, member: 477979"] I am not an expert on this, but my supposition is that the negative bias on the surface of a conductor is the Schottky Effect ([URL]https://en.wikipedia.org/wiki/Schottky_effect[/URL]). At a small distance we will see the field arising from the negative charge, whilst at long distances, by superposition, we will see the fields of both negative and positive charges in the material, which add up to zero. It is interesting that although a piece of metal appears from a distance to be uncharged, we are actually seeing very intense fields from the massive electron charge and an equal and opposite ionic charge. If now an accelerating field, such as from a battery, is placed transversly across the metal, the electrons immediately accelerate but the ions do not. The electrons now develop a field opposing the acceleration, which we see a small time later as radiation. In other words the fine balance of the very large superimposed fields has been broken. [/QUOTE]
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Electromagnetism
Surface charge of neutral solids
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