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Two identical positive charges are place...

Two identical positive charges are placed at the diagonally opposite corners of a square and two more identical but negative charges are placed at the remaining two corners. What is the work done in putting all charges together at the centre if q is the magnitude of each charge and 2a is the length of each side of the square?

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The correct Answer is:
`q^2((4-sqrt2))/(8piepsilon0a)j`
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