The work done required to put the four charges together at the corners of a square of side $a$ , as shown in the figure is

826-632

  • A

    $\frac{1}{{4\pi {\varepsilon _0}}}\frac{{{q^2}}}{a}$

  • B

    $\frac{{ - 2.6}}{{4\pi {\varepsilon _0}}}\frac{{{q^2}}}{a}$

  • C

    $ + \frac{{2.6}}{{4\pi {\varepsilon _0}}}\frac{{{q^2}}}{a}$

  • D

    none of these

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