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FIGURE 15-7 +Q 40) As shown in Fig. 15-7, a point charge of -Q is placed at the center of a square, and a second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2 N acts on the positive charge at the center. What is the magnitude of the force that acts on the center charge if a third charge of-Q is placed at the lower-left corner? A)22 N B)2/4% N C) zero D) 4N

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