The correct options that describe what is happening between the two pith balls that each have negative charges are:
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Since both pith balls have a negative charge, there will be a repulsive electric force between them, pushing them away from each other.
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The greater the distance between the pith balls, the electric force between them becomes less.
The reasoning is as follows:
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Like charges repel each other, which is why the negative charges on the pith balls cause them to push away from one another.
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The electric force between two charged objects decreases with an increase in distance, according to Coulomb's law.