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Q.

We can identify the north pole of a magnet by[77] using

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a

Another magnet has its poles marked North and South poles

b

Another magnet, whether the poles are marked or not

c

An iron bar

d

Iron filings

answer is A.

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Detailed Solution

We can identify the north pole of a magnet by[78] using another magnet that has its poles marked North and South poles.
The magnet with the marked North-South poles can be used to find the magnet between two bars. A magnet with known poles will attract and repel two ends of a magnet, but an ordinary bar will attract both ends. This is referred to as a repulsion test. The same test can be used to determine the poles of unknown magnets. The given magnet's north pole repulses the north pole of an unknown magnet.

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