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. . .. It turns out that the net force on the probe
charge dQ, when it is in the middle of the opening (at d=R from
the center), is exactly the same as if the remaining charge, Q-dQ,
were concentrated at one point 2*R away (on the opposite end of
the diameter). . . . . . . . . . . . . . . .*****
Ludwik Kowalski