Electric field intenstity of a cube

Homework Statement

Eight point charges of 1ηC each are located at the corners of a cube in free space that is 1m on a side.Find |E| at the centre of a)the cube b)a face c)an edge.

The Attempt at a Solution

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Simon Bridge
To get started - you know the equation for the field due to a single charge - you just add them up for all the charges, remembering that $\vec{E}$ is a vector.