A point charge at origin results in a electrical field E %3D -r. please calculate its divergence D·E of this vector field E.

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4. A point charge at origin results in a electrical field E = - r,
4πα
please calculate its divergence 7· E of this vector field E.
Transcribed Image Text:4. A point charge at origin results in a electrical field E = - r, 4πα please calculate its divergence 7· E of this vector field E.
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