To determine which pair of objects will have an attractive electric force, we need to apply the principle that like charges repel each other and opposite charges attract each other.
Let's analyze each pair:
- Pair A: (-2, -1): Both charges are negative. They will repel each other.
- Pair B: (-3, +1): One charge is negative and the other is positive. They will attract each other.
- Pair C: (+3, +1): Both charges are positive. They will repel each other.
- Pair D: (+1, +2): Both charges are positive. They will repel each other.
The only pair with an attractive electric force is Pair B.
So the correct response is Pair B.
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