The objectives of this paper are to develop a numerical model to accurately predict the electrostatic forces (attractive and repulsive) that develop between charged polymer particles in contact with a grounded carbon fiber and use the results to determine the particle-to-particle equilibrium spacing on the carbon fiber as a function of the attractive force and associated friction coefficient that exists between the particle and the carbon fiber surface. The numerical model was validated with closed form solution to predict repulsive electrostatic force between two particles in space. The numerical approach is extended to predict electrostatic forces in a multicomponent system consisting of two interacting polystyrene particles in contact with a carbon fiber. A parametric study is conducted to study the effects of particle spacing, particle surface charge, and particle radii ratios (R2/R1 = 1, 2, and 5) on electrostatic forces. The parametric results are useful in the design of electrostatic powder impregnation processes for composites where the fiber volume fraction is determined by the diameter of particle size, particle charge and equilibrium spacing governed by electrostatic forces and particle/fiber surface frictional interactions.