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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 -.

A

`frac(1)(4 pi varepsilon_0) frac(2qQ)(a)[1+1/sqrt5]`

B

`frac(1)(4 pi varepsilon_0) frac(2qQ)(a)[1-2/sqrt5]`

C

`frac(1)(4 pi varepsilon_0) frac(2qQ)(a)[1-2/sqrt5]`

D

`frac(1)(4 pi varepsilon_0) frac(2qQ)(a)[1-1/sqrt5]`

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