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If these are point charges each will apply a force F, so I guess the answer is 2F.

If they are charges of finite physical size then the force from each won't be in line, so the result will be less.

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Q: A charge of plus Q attracts a charge of -Q 1 cm away with a force of F Another charge of plus Q is placed next to the first one The force on the charge of -Q is now?
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