Assume that an electric field $\overrightarrow E = 30{x^2}\hat i$ exists in space. Then the potential difference $V_A -V_O$, where $V_O$ is the potential at the origin and $V_A$ the potential at $x = 2\, m$ is
A$-80$
B$80$
C$120$
D$-120$
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A$-80$
a $\int \mathrm{d} \mathrm{v}=-\int \mathrm{E} \mathrm{d} \mathrm{x}$
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