Assume that an electric field $\overrightarrow{\mathrm{E}}=30{\mathrm{x}}^2\hat{\mathrm{i}}$ exists in space.  Then the potential difference ${\mathrm{V}}_0-{\mathrm{V}}_{\mathrm{A}}$, where ${\mathrm{V}}_0$ is the potential at the origin and ${\mathrm{V}}_{\mathrm{A}}$ the potential at x = 2 m is