QuestionMarch 20, 2026

Question 3. Three unmarked bar magnets are tested in pairs at their ends. The following observations are made: - Magnet A and Magnet B attract each other. - Magnet A and Magnet C repel each other. - Magnet B and Magnet C repel each other. Which of the following statements can be determined from these results alone? A. Magnets A and B have like poles near each other. B. Magnets A and C have like poles near each other. C. Magnets B and C have unlike poles near each other. D. All three magnets have the same pole at one end.

Question 3. Three unmarked bar magnets are tested in pairs at their ends. The following observations are made: - Magnet A and Magnet B attract each other. - Magnet A and Magnet C repel each other. - Magnet B and Magnet C repel each other. Which of the following statements can be determined from these results alone? A. Magnets A and B have like poles near each other. B. Magnets A and C have like poles near each other. C. Magnets B and C have unlike poles near each other. D. All three magnets have the same pole at one end.
Question 3. Three unmarked bar magnets are tested in pairs at their ends. The following observations are made: - Magnet A and Magnet B attract each other. - Magnet A and Magnet C repel each other. - Magnet B and Magnet C repel each other. Which of the following statements can be determined from these results alone? A. Magnets A and B have like poles near each other. B. Magnets A and C have like poles near each other. C. Magnets B and C have unlike poles near each other. D. All three magnets have the same pole at one end.

Solution
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Answer

Magnets A and C have like poles near each other (Option B) Explanation 1. Interpret attraction and repulsion Attraction means unlike poles facing; repulsion means like poles facing. 2. Apply observations A attracts B ⇒ facing ends are opposite poles. A repels C ⇒ facing ends are same pole. B repels C ⇒ facing ends are same pole. 3. Deduce relation From A attracts B: B’s facing pole is opposite to A’s. From A repels C: C’s facing pole is same as A’s. From B repels C: C’s facing pole is same as B’s — but B’s facing pole differs from A’s (conflict). This conflict means "same pole" for B and C is consistent only if both have the same pole at that end, opposite to A’s facing end — but that contradicts A repels C (since same poles repel). The consistent reading: B and C repel → same poles; A repels C → same poles; ⇒ B and C have like poles near each other.

Explanation

1. Interpret attraction and repulsion <br /> Attraction means unlike poles facing; repulsion means like poles facing. <br />2. Apply observations <br /> A attracts B ⇒ facing ends are opposite poles. <br /> A repels C ⇒ facing ends are same pole. <br /> B repels C ⇒ facing ends are same pole. <br />3. Deduce relation <br /> From A attracts B: B’s facing pole is opposite to A’s. <br /> From A repels C: C’s facing pole is same as A’s. <br /> From B repels C: C’s facing pole is same as B’s — but B’s facing pole differs from A’s (conflict). <br /> This conflict means "same pole" for B and C is consistent only if both have the same pole at that end, opposite to A’s facing end — but that contradicts A repels C (since same poles repel). The consistent reading: B and C repel → same poles; A repels C → same poles; ⇒ B and C have like poles near each other.
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