The electric field at a point on the x-axis due to a point charge can be calculated using Coulomb's law:
$$E = \frac{kQ}{r^2}$$
where $E$ is the electric field, $k$ is the electrostatic constant ($9 \times 10^9 \mathrm{~N \cdot m^2/C^2}$), $Q$ is the charge, and
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