1st off, What is the meaning of point charge exactly, like can a point charge be of any size as long as it is concentrated at one point, so you could have a point charge of 1 coulomb, 1 ft in diameter for example?

2nd, According to HyperPhyics

"If two one-second collections of 1 Coulomb each were concentrated at points one meter apart, the force between them could be calculated from Coulomb's Law. " then has some calculations.

next

"If two such charges could indeed be concentrated at two points a meter apart, they would move away from each other under the influence of this enormous force, even if they had to rip themselves out of solid steel to do so!"

The question is how does the spacing or geometry of the each charge effect the force, like the difference between a 1 m/sq square for both and a 1 ft/sq square for both charges?

I guess it really comes down to exactly defining what is meant by point charge?