Question: Point charges q and --q are located at the vertices of a square with diagonals 2l as shown in Fig. 3.1. Find the magnitude of

Point charges q and --q are located at the vertices of a square with diagonals 2l as shown in Fig. 3.1. Find the magnitude of the electric field strength at a point located symmetrically with respect to the vertices of the square at a distance x from its centre.

b- +9 21 b- --

b- +9 21 b- --

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