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Two charges of +.25C are placed at the points 1.25mm,0mm and -1.25mm, 0mm. A third charge...

Two charges of +.25C are placed at the points 1.25mm,0mm and -1.25mm, 0mm. A third charge of -.45 C is placed at the origin.

a)What is the electric field at the point 0, 2.2mm?

b)At what point on the y axis will E be 0?

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