$\begin {array} {1 1} (1)\;\large\frac{4Kq}{l^2} & \quad (2)\;\large\frac{16Kq}{5\sqrt 5.l^2} \\ (3)\;\large\frac{8Kq}{\sqrt 5.l^2} & \quad (4)\;\large\frac{Kq}{l^2} \end {array}$

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