Review Conceptual Example 11 before attempting to work this problem. Four charges with equal magnitudes of 7.28×10−12 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 2.52 cm and 4.16 cm. Find the magnitude of the electric field at the center of the rectangle in Figures a and b. (a) (b) (a) Number Units (b) Number Units
