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3. In the figure, a central particle of charge -2q is surrounded by a square array of
charged particles, separated by either distance d or d/2 along the perimeter of the
square. What are the magnitude and direction of the net electrostatic force on the
central particle due to the other particles? (Hint: Consideration of symmetry can
greatly reduce the amount of work required here.)
-79
+49
+2q
-39
-59
+3q
-59
-39
+24
+4q
-79

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