1. The problem statement, all variables and given/known data 4 identical charges each equal to Q are placed at the 4 vertices of a regular triangular pyramid of each side equal to 'a'. Find the net electrostatic force on any one charge. 2. Relevant equations F = kQ^2/a^2 3. The attempt at a solution find the force due to each of the charges, resolve it into x- and y- components and hence add them..but this way i could not get the correct answer.