A cube of side 'a' has point charges +Q ...

A cube of side 'a' has point charges +Q located at each of its vertices except at the origin where the charge is -Q. The electric field at the centre of cube is :

`(-Q)/(3sqrt3 pi epsi_0 a^2) ( hatx + haty + hatz)`

`(-2Q)/(3sqrt3 pi epsi_0 a^2) (hatx +haty + hatz)`

`(2Q)/(3sqrt3 pi epsi_0 a^2) (hatx + haty +hatz)`

`(Q)/(3sqrt3 pi epsi_0 a^2) (hatx + haty + hat z)`

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