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 -.

Options

A. `(1)/(4pi epsilon_(0))(2qQ)/(a) (1-(1)/(sqrt(5)))`
B. zero
C. `(1)/(4pi epsilon_(0))(2qQ)/(a) (1+(2)/(sqrt(5)))`
D. `(1)/(4pi epsilon_(0))(2qQ)/(a) (1-(2)/(sqrt(5)))`

Answer

A