We can calculate for the electric field using the Coulombs
law. The mathematical expression for this is:
F = k q1 q2 / r^2
Where,
F = force of electric field
k = Coulombs constant = 8.988 * 10^9 N m^2 / C^2
q = charge of one particle in absolute value
r = distance between the two charges = 4 m
Substituting the given values to the equation:
F = (8.988 * 10^9 N m^2 / C^2) (8 * 10^-9 C) (2 *
10^-9 C) / (4 m)^2
F = 8.988 * 10^-9 N
The two charges attract with an electric field of 8.988 * 10^-9 N
