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First three charges of the infinite system of image charges that provide the exact solution of the PE equation for the parallel plates geometry. A unit positive source charge is located at (z = z0, x = 0), and the first three images, also unit charges, are at ( − z0, 0), ( − 2a + z0, 0), and (2a − z0, 0). The potential is calculated at (z, x).
