Equations 22-8 and 22-9 are approximations of the magnitude of the electric field of an electric dipole, at points along the dipole axis. consider a point p on that axis at distance z = 3.00d from the dipole center(where d is the separation distance between the particles of the dipole). let eappr be the magnitude of the field at point p as approximated by equations 22-8 and 22-9. let eact be the actual magnitude. by how much is the ratio eappr/eact less than 1?