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Q. Three point charges are arranged at the corners of a square, with charge -Q on both the particle at the upper left corner and the particle at the lower right corner and with charge +2Q on the particle at the lower left corner. (i) what is the direction of the electric field at the upper right corner, which is a point in empty space? (ii) suppose the +2Q charge at the lower left corner is removed. then does the magnitude of the field at the upper right corner (a) become larger (b) become smaller (c) stay the same (d) change unpredictably?

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