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Which change increases the electric force between objects?
Two neutral objects are moved closer together.
Electrons are added to two negatively charged objects.
Two oppositely charged objects are moved farther apart.
The charge on two positively charged objects is reduced.
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Electrons are added to two negatively charged objects.
By Coulomb’s law F = k|q1 q2|/r^2, the force magnitude increases if the magnitudes of the charges increase or the distance decreases. Adding electrons increases the magnitudes of both negative charges (so |q1 q2| grows), so the electric force (repulsion) increases. The other options either keep charges zero, increase distance, or reduce charge magnitude, which do not increase the force.
By Coulomb’s law F = k|q1 q2|/r^2, the force magnitude increases if the magnitudes of the charges increase or the distance decreases. Adding electrons increases the magnitudes of both negative charges (so |q1 q2| grows), so the electric force (repulsion) increases. The other options either keep charges zero, increase distance, or reduce charge magnitude, which do not increase the force.
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