Consider two charged metallic spheres $S_1$ 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 $V_1\left(\right.$ on $\left.S_1\right) / V_2\left(\right.$ on $\left.S_2\right)$ of the electrostatic potentials on each sphere is