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Point charges q1 = q2 = 3.3 ✕ 10−6 C are fixed on the x-axis at...

Point charges q1 = q2 = 3.3 ✕ 10−6 C are fixed on the x-axis at x = −3.9 m and x = 3.9 m. What charge q (in C) must be placed at the origin so that the electric field vanishes at x = 0, y = 3.9 m?

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