PX275 - B1g - spherical polar representation

\vec{E} = \frac{Q}{4 π ϵ_{0} r^{2}} (r \sin θ \cos ϕ \hat{i} + r \sin θ \sin ϕ \hat{j} + r \cos θ \hat{k})

\vec{E} = \frac{Q}{4 π ϵ_{0} r^{2}} {\hat{e}}_{r}