# Electric field intenstity of a cube

1. Aug 29, 2012

### navya17

1. The problem statement, all variables and given/known data

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.

2. Relevant equations

3. The attempt at a solution

2. Aug 29, 2012

### Simon Bridge

Welcome to PF;
It helps if you try to do a bit first, then we can target the specific area you need help.

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.
Hint: you can use the symmetry of the cube, with the fact that each corner has the same charge, to simplify the problem.