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The work which is required to be done to...

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))(kq^(2))/(a)`

B

`4(kq^(2))/(a)`

C

`(2+sqrt(2))(kq^(2))/(a)`

D

`2(kq^(2))/(a)`

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