(Originais Teachy 2023) - Question Medium of Physics

A positive electric charge particle q and mass m is initially at rest at a point P. At a given moment, a particle with identical negative charge -q and the same mass m is launched from a point A, located at a distance d from P, with velocity v0 forming an angle θ with the line PA, as shown in the figure. Considering the electromagnetic interaction between the particles as the only acting force and that the electric field between them is uniform, answer: 1. What is the maximum electric force experienced by the negative particle during the movement due to the interaction with the positive particle? 2. Knowing that the negative particle reverses its direction of movement after passing through P, determine the expression for the electric field E between the particles as a function of the provided variables and fundamental constants. Consider that the Coulomb constant in vacuum is 8.9875 x 10^9 N m^2/C^2.