, are placed at 5.- Three point charges: q₁ = 10.2 x 10-6 C, q2 = -8.6 x 10-6 C, q3 = 6.4 x 10-6 C, the points P(3,4), Q (-4,2); R (2, -4). Calculate the electric potential at point A (-1, +1).
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