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Four charges +q, -q, +q and -q are place...

Four charges `+q, -q, +q` and `-q` are placed in order on the four consecutive corners of a square of side a. The work done in interchanging the positions of any two neighboring charges of the opposite sign is

A

`(q^(2))/( 4pi epsilon_(0)L) ( - 4 + sqrt(2))`

B

`(q^(2))/( 4pi epsilon_(0)L) ( 4 + sqrt(2))`

C

`(q^(2))/( 4pi epsilon_(0)L) ( 4 - 2sqrt(2))`

D

`(q^(2))/( 4pi epsilon_(0)L) ( 4 + 2sqrt(2))`

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