Hi Mandy!
Question - How does increasing the amount of charge on an object affect the electric force it exerts on another charged object?
Answer - The electric force increases because the amount of charge has a direct relationship to the force.
Why - The affect that the force exerts on another object that is also charge is becase the fact that when the electric force increases is when the charge is direct with the object with the force.
Hope This Helps :)
