A Uniform Electric Field Has the Strength Of $7.0 \mathrm {~N} / \mathrm { C }$

Multiple Choice

A uniform electric field has the strength of $7.0 \mathrm {~N} / \mathrm { C }$ . What is the electric energy density of this field? $\left( \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } \right)$

A) $2.8 \times 10 ^ { 12 } \mathrm {~J} / \mathrm { m } ^ { 3 }$
B) $3.1 \times 10 ^ { - 11 } \mathrm {~J} / \mathrm { m } ^ { 3 }$
C) $5.5 \times 10 ^ { 12 } \mathrm {~J} / \mathrm { m } ^ { 3 }$
D) $2.2 \times 10 ^ { - 10 } \mathrm {~J} / \mathrm { m } ^ { 3 }$