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In an unmarked magnet, the North Pole of it can be identified by

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placing another magnet with marked north and south pole

Another magnet without marked north and south pole

Using an iron bar

Using iron filings

answer is A.

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Detailed Solution

In an unmarked magnet, the North Pole can be identified by placing another magnet with marked north and South Pole.
Magnet:
An object which is capable of attracting unlike poles and repelling like poles is called a magnet.
In a magnet, opposite poles attract each other, and the same poles are repealed by each other. When we take the South Pole of a marked magnet closer to an unmarked magnet, the poles where these magnets attract will help us identify the North Pole of the unknown magnet.
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