You're right to question this scenario. It's impossible for the movement of electrons between two objects with balanced charges to result in a charge buildup in both objects. Here's why:

* Balanced Charges: Objects with balanced charges have an equal number of protons (positive charges) and electrons (negative charges). This means they are electrically neutral.

* Conservation of Charge: A fundamental principle in physics is the conservation of charge. This means that the total amount of electric charge in an isolated system remains constant.

Here's how charge buildup usually occurs:

1. Friction: When two objects are rubbed together, electrons can be transferred from one object to the other. This transfer creates an imbalance of charges, with one object gaining a net negative charge (excess electrons) and the other gaining a net positive charge (deficit of electrons).

2. Conduction: If a charged object touches a neutral object, electrons can flow from the charged object to the neutral object. This flow of electrons equalizes the charge distribution, but the neutral object now acquires a charge.

3. Induction: A charged object can influence the charge distribution of a neutral object without direct contact. This occurs because the electric field from the charged object repels or attracts electrons within the neutral object, creating a temporary separation of charges.

The key point is that charge buildup requires a net transfer of electrons, leading to an imbalance of charges. If two objects start with balanced charges, any movement of electrons must be balanced, preventing a charge buildup in both.