Answer:
![9\cdot 10^9 N](https://img.qammunity.org/2020/formulas/physics/middle-school/mj11wzmg16rx74v2u5ua6569xkj9violi6.png)
Step-by-step explanation:
The magnitude of the electrical force between the two point charges is
![F=k(q_1 q_2)/(r^2)](https://img.qammunity.org/2020/formulas/physics/high-school/itwxhnt3zxt9ptmy812nb6j3yub8evq9o1.png)
where
k is the Coulomb's constant
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
![F=(9\cdot 10^9 Nm^2C^(-2))((+3 C)^2)/((3.00 m)^2)=9\cdot 10^9 N](https://img.qammunity.org/2020/formulas/physics/middle-school/tcxn3k17qmmkowr3kxsietld1qyeujrk65.png)