$\Rightarrow K \frac{Q_{1}}{r_1}=K \frac{Q_{2}}{r_{2}}$

$\Rightarrow \frac{Q_{1}}{r_{1}}=\frac{Q_{2}}{r_{2}}$

The ratio of electric fields

$\frac{E_{1}}{E_{2}}=\frac{K \frac{Q_{1}}{r_{1}^{2}}}{K \frac{Q_{2}}{r_{2}^{2}}}=\frac{Q_{1}}{r_1^{2}} \times \frac{r_{2}^{2}}{Q_{2}}$

$\Rightarrow \frac{E_{1}}{E_{2}}=\frac{r_{1} \times r_{2}^{2}}{r_1^{2} \times r_{2}}$

$ \Rightarrow \frac{E_{1}}{E_{2}}=\frac{r_{2}}{r_{1}}=\frac{2}{1}$

since the distance between the spheres is large as compared to their diameters, the induced effects may be ignored.