Answer:
[tex]9\cdot 10^9 N[/tex]
Explanation:
The magnitude of the electrical force between the two point charges is
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
[tex]q_1 =q_2 = +3.0 C[/tex] is the magnitude of each charge
r = 3.00 m is the separation between the two charges
Substituting the numbers into the formula, we find
[tex]F=(9\cdot 10^9 Nm^2C^{-2})\frac{(+3 C)^2}{(3.00 m)^2}=9\cdot 10^9 N[/tex]
