At the vertices of a rectangle with base a = 4m and height b = 2m there are four point loads (see figure). The origin of the coordinate system is at the center of the rectangle. Determine the electric field at the center of the rectangle (A).   Data: | q | = 1nC; ke = 8.98 × 109Nm2 / C2

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Rectangular Coordinate System

In a rectangular coordinate system, each point based on the pair of coordinates is specified uniquely in the plane. From two fixed perpendicular lines, these coordinates are at a distance in the rectangular coordinate system. Each line is known as the reference axis and axes as plural. The point where they meet is called the origin (0,0).