What the Electric Energy Density at a Point $1.0 \mathrm {~cm}$

Short Answer

What the electric energy density at a point $1.0 \mathrm {~cm}$ from a proton? $\left( e = 1.6 \times 10 - 19 \mathrm { C } , \varepsilon _ { 0 } = \right.$
$$\left. 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } , k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$$