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The electric potential in a certain region of space depends only on the x-coordinate as $V = - a x^{3} + β$ , where $α$ and $β$ are constants. Find the volume distribution of space charge $p (x)$ .
$p (x) = 6 α ε_{0} x$
$p (x) = 7 α ε_{0} x$
$p (x) = 8 α ε_{0} x$
$p (x) = 9 α ε_{0} x$

A

p (x) = 7 α ε_{0} x

B

p (x) = 6 α ε_{0} x

C

p (x) = 8 α ε_{0} x

D

p (x) = 9 α ε_{0} x

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