Two bar magnets are labeled A and B. The ends of each magnet are numbered 1 or 2, but the poles are not labeled. When A1 is brought near B1, the bars repel.
Answer
A
A1 is the north pole of a magnet, and B1 is the south pole of a magnet.
B
A1 is the north pole of a magnet, and B1 is the north pole of a magnet.
C
A1 and B1 are opposite poles, but there is not enough information to tell which ones.
D
A1 and B1 are like poles, but there is not enough information to tell whether they are north poles or south poles.
Explanation
Like magnetic poles repel, while opposite poles attract. Since A1 and B1 repel, they must be the same kind of pole. The information does not reveal whether both are north poles or both are south poles, so D is correct.
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