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3.- Four point charges are placed at the vertices of a square with a side of 12 cm. If
q₁ = 8.2 x 10-6 C, q2 = 4.6 x 10-6 C, q3 = 6.4 x 10-6 C, q4 = 14.6 x 10-6 C.
Calculate the electric field at the center of the square.
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