This simulation provides a numerical approximation to the motion of a charge in the field of a fixed electric dipole.
Approximations calculated numerically are subject to many kinds of error.
Always keep this in mind when interpreting the results of this simulation. They are fixed in space and produce an electric dipole field. To run the simulation, first drag the larger positive red charge to an initial location. If desired, change the initial values of the x, y and z components of the position of this charge by typing new values in the appropriate boxes. The numerical integration schemes employed in this simulation will eventually move the charge off of its starting point when the problem is stiff, but you may be waiting quite a while for this to occur.