Question

which change increases the electric force between objects?
o two neutral objects are moved closer together.
o electrons are added to two negatively charged objects.
o two oppositely charged objects are moved farther apart.
o the charge on two positively charged objects is reduced.

Explanation:

The electric force between charged objects is given by Coulomb's law $F = k\frac{q_1q_2}{r^2}$, where $k$ is a constant, $q_1$ and $q_2$ are the charges of the two objects, and $r$ is the distance between them. Adding electrons to two negatively - charged objects increases their charges ($q_1$ and $q_2$). According to the formula, when the charges increase, the electric force increases. Neutral objects have no electric force between them based on Coulomb's law. Moving oppositely - charged objects farther apart or reducing the charge on positively - charged objects decreases the electric force.

Answer:

Electrons are added to two negatively charged objects.