What is the electric displacement field for one electron?

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The Electric Displacement field, D, is influenced by the surrounding material and is calculated as the product of the permittivity of that material and the electric field E. For a single electron, the divergence of D should correspond to the charge density, allowing for practice with the divergence theorem. Understanding this relationship is crucial for applying Maxwell's equations effectively. The explicit formula for D can be derived based on these principles. Mastery of these concepts will enhance comprehension of electromagnetic theory.
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I am teaching myself Maxwells equations for fun and this question may be gibberish but I would like to know know the explicit formula for D for a single elecron so I can practice my use of the divergence theorem and check the divergence is the charge density.
 
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The Electric Displacement vector, D, will depend on the surrounding material. The formula for D is just the permittivity of the surrounding material multiplied by E (in S.I. units).

Claude.
 
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