Variation in electric potential is maximum if one goes
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$\Delta \mathrm{V}=-\int \overrightarrow{\mathrm{E}} \cdot \mathrm{d} \overrightarrow{\mathrm{r}} \quad \therefore \Delta \mathrm{V} \propto \cos \theta$
$\Delta \mathrm{V}$ is max. for $\theta=0^{\circ}$ or $\theta=180^{\circ}$
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