To find the electrostatic potential \( V(r, \theta) \), we use the formula for the potential due to point charges:
\[ V(r, \theta) = \frac{1}{4\pi\epsilon_0} \left( \frac{q}{r_a} - \frac{q}{r_{-a}} \right) \]
where \( r_a = \sqrt{r^2 + z_a^2 - 2rz_a\cos\theta} \)
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