Two positive charges of magnitude `q` are placed at the ends of a side ( side 1) of a square of side `2a` . Two negative charges of the same magnitude are kept at the other corners . Staring from rest , `n` a charge `Q` moves from the middle of side `1` to the centre of square , its kinetic energy at the centre of square is -.
A. `1/(4 pi in_0) (2qQ)/a ( 1 + 1/(sqrt5))`
B. `1/(4 pi in_0) (2qQ)/a ( 1 + 1/(sqrt5))`
C. `1/(4 pi in_0) (2qQ)/a ( 1 + 1/(sqrt5))`
D. `1/(4 pi in_0) (2qQ)/a ( 1 + 1/(sqrt5))`
