Electrical potential energy of a systemMedium

Potential Energy of Charge Configurations

In the first configuration (1) as shown in the figure, four identical charges (q₀) are kept at the corners A,B,C and D of square of side length 'a'. In the second configuration (2), the same charges are shifted to mid points G,E,H and F, of the square, If $K = \frac{1}{{4\pi {\varepsilon _0}}}$ , the difference between the potential energies of configuration (2) and (1) is given by :

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