The maximum electric field intensity on the axis of a uniformly charg…

$\frac{1}{4 \pi \varepsilon_0} \frac{q}{3 \sqrt{3} R^2}$

$\frac{1}{4 \pi \varepsilon_0} \frac{2 q}{3 R^2}$

$\frac{1}{4 \pi \varepsilon_0} \frac{2 q}{3 \sqrt{3} R^2}$

$\frac{1}{4 \pi \varepsilon_0} \frac{3 q}{2 \sqrt{2} R^2}$