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Charges +q and -q are located at the cor...

Charges `+q` and `-q` are located at the corners of a cube of side as show in the figure. Find the work done to separate the charges to infinite distance

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The correct Answer is:
A, B, C, D
`W_(external)=DeltaPE=(1)/(4piepsilon_0)(q^2)/(a)[-3/1+3/sqrt2-1/sqrt3]xx4`
`=(1)/(4piepsilon_0)(q^2)/(a)*(4)/(sqrt6)[3sqrt3-3sqrt6-sqrt2]`
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