Expressions for the electric form factors of the proton and neutron have been given in the charged-scalar and symmetrical pseudoscalar meson theories. Calculations have been done in the strong-coupling limit. Both theories explain the experimental data given by the Stanford and Cornell groups very well. In the pseudoscalar theory, however, we have to take an effective meson mass which is about one-half of the rest mass. Small effective mass can be understood if a cubic term is introduced in the equation of motion for mesons. In the numerical integration of this equation, the strength g√λ has been obtained from the boundary conditions, g and λ being the coupling constants of the pion-nucleon and pion-pion fields, respectively. With numerical solutions, the nucleon form factors have been recalculated. They fit the experimental data quite well.