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A law in classical electromagnetism and Newtonian gravity which relates (charge) density to the divergence of a field, or alternatively the charge in a volume to the flux through the bounding surface.
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Couple of questions about Gravitational field of an infinite plane
Here is an attempt to answer this question from a general relativistic point of view.
To enable a comparison with a spherical body, let the height above the plane be 'r', the 2 horizontal coordinates …