The work which is required to be done to make an arrangement of four particles each having a charge $+q$ such that the particles lie at the four corners of a square of side $a$ is .......

  • A

    $(4+\sqrt{2}) \frac{k q^2}{a}$

  • B

    $4 \frac{ kq ^2}{ a }$

  • C

    $(2+\sqrt{2}) \frac{k q^2}{a}$

  • D

    $2 \frac{k q^2}{a}$

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