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Suppose there is a metal disk with an initial excess of charge represented by the four red electrons. Naturally, they reach their equilibrium position on the surface. After this, a new electron (the green one) is added exactly at the center. The repelling forces from the red charges cancel each other out, so the green charge remains there and produces an electrostatic configuration with [itex]q_{in} \neq 0[/itex]. Is this all possible?

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