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Two charges Q1 = -3 μC and Q2 = +3 μC are located on the y-axis...

Two charges Q1 = -3 μC and Q2 = +3 μC are located on the y-axis at y1 = -5 cm and y2 = +5 cm respectively. A third charge Q3 is added on the y-axis at y3 = -10 cm so that the electric field at the origin is equal to zero. What is the charge Q3?

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