\(E_p=\frac{k q}{r^2} \quad \dots (i)\)
\(E_Q=\frac{k q}{(2 r)^2}+\frac{k \cdot 3 q}{(2 r)^2}\)
\(=\frac{k q}{4 r^2}+\frac{k \cdot 3 q}{4 r^2}\)
\(=\frac{k q}{r^2} \quad \dots (ii)\)
\(E_P: E_Q=1: 1\)
$\left(\frac{1}{4 \pi \epsilon_{0}}=9 \times 10^{9} Nm ^{2} / C ^{2}\right)$