7. Figures (a) and (b) below show the arrangement of 4 charges at the corners of...

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7. Figures (a) and (b) below show the arrangement of 4 charges at the corners of a square. All of the charges have the same magnitude, with their polarities indicated. Use symmetry arguments to sketch an arrow that represents the net electric field vector at point P at the center of the square in each case. (b) + 7. Figures (a) and (b) below show the arrangement of 4 charges at the corners of a square. All of the charges have the same magnitude, with their polarities indicated. Use symmetry arguments to sketch an arrow that represents the net electric field vector at point P at the center of the square in each case. (b) +