P5. Two coaxial rings, each of radius R, made of thin wire are separated by a small distance d (d « R) and carry the charges q and -q. Find the electric field strength at the axis of the system as a function of the x coordinate. Show that this result is equivalent of an electric field of an electric dipole, which is oriented along the x axis. | d b- R.

P5. Two coaxial rings, each of radius R, made of thin wire are separated by a small distance d (d « R) and carry the charges q and -q. Find the electric field strength at the axis of the system as a function of the x coordinate. Show that this result is equivalent of an electric field of an electric dipole, which is oriented along the x axis. | d b- R.