Two positive charges of magnitude q are ...

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 , a charge `Q` moves from the middle of side `1` to the centre of square , its kinetic energy at the centre of square is -.

zero

`1/(4pi epsi_(0)) (2qQ)/a (1+1/sqrt(5))`

`1/(4pi epsi_(0)) (2qQ)/a (1-2/sqrt(5))`

`1/(4pi epsi_(0)) (2qQ)/a (1-1/sqrt(5))`

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