Final answer:
Doubling the net charge on one object increases the electrostatic force between it and another object to twice its original value, according to Coulomb's law.
Step-by-step explanation:
Doubling the net charge on one object while keeping the charge on a second object unchanged increases the electrostatic force between the two objects to two times its original value. This is because the force, according to Coulomb's law, is directly proportional to the product of the charges of the objects involved and inversely proportional to the square of the distance between them. If the net charge on one object was initially +2 and is doubled, the new net charge becomes +4. If it was -3 and is doubled to -6, it remains negatively charged but with a greater magnitude of charge.
When dealing with distributed charges, a concentration of charge along the side closest to an oppositely charged object will occur, further increasing the force. This is important in real-world applications where charged surfaces or areas interact.
Moreover, whenever an object gains or loses electrons, the net charge changes. If an object with a charge of 1 C gains electrons, its net charge becomes more negative by a value determined by the amount and charge of the electrons gained. This conservation of charge also dictates that the neutral object loses a corresponding amount of charge.