Assume that an electric field $\overrightarrow E = 30{x^2}\widehat i$ 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 :
$120$ $J/C$
$-120$ $J/C$
$-80$ $J/C$
$80$ $J/C$
Solution
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