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
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
- 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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