Consider the configuration of a system of four charges each of value $+q$ . The work done by external agent in changing the configuration of the system from figure $(1)$ to figure $(2)$ is
Consider the configuration of a system of four charges each of value $+q$ . The work done by external agent in changing the configuration of the system from figure $(1)$ to figure $(2)$ is
- A
$\frac{{k{q^2}}}{a}\left( {3 - \sqrt 2 } \right)$
- B
$\frac{{ - k{q^2}}}{a}\left( {3 + \sqrt 2 } \right)$
- C
$\frac{{k{q^2}}}{a}\left( {3 + \sqrt 2 } \right)$
- D
$\frac{{ - k{q^2}}}{a}\left( {3 - \sqrt 2 } \right)$
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