By seeing if it repels or attracts another known magnet.
This question related to Chapter 4 Science Curiosity Class 6th NCERT.
From the Chapter 4. Exploring Magnets.
Give answer according to your understanding.
How can you identify a magnet among three identical-looking metal bars?
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By seeing if it repels or attracts another known magnet.
Explanation: Only a magnet can repel another magnet, so testing for repulsion identifies it.
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