a
\(\frac{ F _e}{ F _{ G }}=\frac{\frac{ Kq _1 q _2}{ r ^2}}{\frac{ Gm _1 m _2}{ r ^2}}\)

\(2.4 \times 10^{39}=\frac{ K }{ G } \times \frac{\left(1.6 \times 10^{-19}\right)^2}{\left(9.11 \times 10^{-31} \times 1.67 \times 10^{-27}\right)}\)

\(\frac{ K }{ G }=\frac{2.4 \times 10^{39} \times 15.2137 \times 10^{-58}}{2.56 \times 10^{-38}}\)

\(=14.26 \times 10^{19}\)

\(=1.426 \times 10^{20}\)

\(\approx 10^{20}\)