point charges q and -q are located at the vertices of a square with diagonals 2l as shown in figure. evaluate the magnitude of the elecrtic field strenght at a point located symmetrically with respect to the vertices of the square at a distance x from the center.
![](https://sahay.guru/wp-content/uploads/2020/08/27-1-1024x474.jpg)
![](https://sahay.guru/wp-content/uploads/2020/08/272-676x1024.jpg)