Six point charges (each of magnitude Q) ...

Six point charges (each of magnitude Q) are placed on the six vertices of a cube of side x such that two adjacent vertices are vacant. Electrostatic field intensity at the centre of the cube is `(k=1/(4pi epsilon_0))`

`(4sqrt2)/sqrt3 (kQ)/x^2`

`(8sqrt2)/(5sqrt3) (kQ)/x^2`

`(8sqrt2)/(3sqrt3) (kQ)/x^2`

`(4sqrt2)/(5sqrt3) (kQ)/x^2`

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