LOOK.....POTENTIAL ENERGY WILL BE
divided into 6 cases...
4 between the all four charges placed and two between the diagonals....
ok........
therefore
U1(for four charges)= 4kq2/D
U2(FOR TWO DIAGONAL CHARGES)=2kq
2/
2 D......
ADD THEM AS POTENTIAL ENERGY IS.....
SCALAR QUANTITY......
HOPE u have understood................
DON.........
Moderation Team
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