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

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= 1/4, the difference between the potential energies of configuration (2) and (1) is given by :

                                                                 (JEE-2025)