To determine which pair of objects will have an attractive electric force, we need to recall that opposite charges attract and like charges repel.
Let's analyze each pair:
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Pair A: Object 1 has a charge of -2, Object 2 has a charge of -1. Both are negative, so they will repel each other.
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Pair B: Object 1 has a charge of -3, Object 2 has a charge of +1. One is negative and the other is positive, so they will attract each other.
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Pair C: Object 1 has a charge of +3, Object 2 has a charge of +1. Both are positive, so they will repel each other.
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Pair D: Object 1 has a charge of +1, Object 2 has a charge of +2. Both are positive, so they will also repel each other.
The only pair that will have an attractive electric force is Pair B.