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  "body": "\n## Summary\n\nThe method of images builds the [[Green's function|M36SD56MWQ]] of a domain from the potential of a point charge by adding fictitious charges outside the domain.\nThe image charges are chosen so that the total potential is zero on the boundary.\nIt gives explicit Green's functions for half-spaces, balls, wedges with special angles and strips.\nIn physics it solves electrostatic problems with grounded conductors.\n\n## Explanations\n\n### L1 human\n\nA point charge near a grounded flat metal plate behaves as if the plate were replaced by an opposite charge at the mirror point behind it.\nOn the plate the two potentials cancel, so the plate condition holds automatically.\nFor the half-space $x_3 \u003e 0$ with a unit charge at $x$, the image is a charge $-1$ at $(x_1, x_2, -x_3)$.\nFor a sphere, the image sits at the inverse point and has a rescaled strength.\n",
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