Consider two charged metallic sphere $S_1$ and $S_2$ of radii $R_1$ and $R_2$, respectively. The electric fields$E_1$(on $S_1$) and $E_2$(on $S_2$) on their surfaces are such that  $E_1/E_2=R_1/R_2$. Then the ratio  $V_1\left(on{S}_1\right)/V_2\left(on{S}_2\right)$ of the electrostatic potentials on each sphere is :