Final answer:
Changing a charge's value directly affects the electrostatic force between two charges, with the force being directly proportional to the product of the charges.
Step-by-step explanation:
Changing the charge's value influences the electrostatic force between two charges significantly. According to Coulomb's law, the electrostatic force is directly proportional to the product of the magnitudes of each charge and inversely proportional to the square of the distance between the two charges. If we increase one charge, say double it, the force between the charges will also double. Similarly, if one charge is tripled, the force will triple, and so on.
For example, if the distance between the charges remains constant but one charge is increased from 1 C to 2 C, the force acting between the charges would double. Conversely, if one charge was decreased from 1 C to 0.5 C, the force would be halved. It is crucial to note that this applies to static charges, or charges that are stationary relative to each other.