The electric field due to a point charge is given by Coulomb's law:
$E = k \frac{|q|}{r^2}$
where $k = 8.98755 \times 10^9 \, Nm^2/C^2$ is Coulomb's constant, $q$ is the charge, and $r$ is the distance from the charge to the point.
In this case, $q = q_2 = -1.6
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