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There is a square with the side a and four equal charges q=1C located in the vertexes. In the x-y coordinates the vertexes are

There is a square with the side a and four equal charges q=1C located in the vertexes. In the x-y coordinates the vertexes are located at: (0,0), (2a,0), (0,2a), (2a, 2a). Sketch the picture, then at the point (4a,a) sketch 4 vectors of the electrostatic field generated by individual charges.

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