We know, from electrostatics, that like charges repel and unlike charges attract each other.
The free-body diagram at the right is for one of the charges in each of the arrangements below.
The charge in the free-body diagram is negative and all of the charges in all three arrangements have the same magnitude. Which charge in each arrangement does the free-body diagram fit? How do you know? What are the signs of the other three charges in each of the arrangements? How do you know?
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