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20- On the x axis, a point charge Q1 = –3.50×10–6 C is placed at x...

20- On the x axis, a point charge Q1 = –3.50×10–6 C is placed at x = –1.60 m, and another point charge Q2 = +2.00×10–6 C is placed at x = +1.80 m. What is the electric field E at the origin, x = 0 m (use positive sign if E points in the +x direction, and negative sign if E points in the –x direction)?

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