Question

Five identical point charges each having charge q are at the corner of hexagon

Answer 1

The five identical charges are placed at five corners of the hexagon, assuming that the sixth charge placed at the remaining corner is not identical to the first five, the force of attraction between the five particles and the unidentical sixth one will be attractive force, the force between two particles will be proportional to product of their charges and inversely proportional to square of the distance between them, we should do vectorial addition to find the net force acting on the sixth particle.