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(A) The electric field $\vec{E}$ is uniform and directed along the positive $x$-axis.The relationship between electric field and electric potential is

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(A) The electric field $\vec{E}$ is uniform and directed along the positive $x$-axis.The relationship between electric field and electric potential is given by $\vec{E} = -
abla V$,which implies that the electric potential $V$ decreases in the direction of the electric field.Since the electric field is directed towards the positive $x$-axis,the potential decreases as we move from left to right along the $x$-axis.Comparing the $x$-coordinates of the given points:Point $C$ is at $x = -a$Points $B$ and $D$ are at $x = 0$Point $A$ is at $x = a$Since the potential decreases as $x$ increases,the potential will be maximum at $C$ and minimum at $A$.

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