Question

North pole of a magnet can be identified by

• A. Another magnet having its poles marked as North pole and South pole.
• B. Another magnet no matter whether the poles are marked or not.
• C. Using an iron bar.
• D. Using iron filings.

Answer 1

The correct option is A

Another magnet having its poles marked as North pole and South pole.

The explanation for the correct option:

Option (a): Another magnet having its poles marked as North pole and South pole.

1. The North pole of a magnet attracts the south pole and repels the north of another magnet.
2. Thus, the magnet's north pole can be identified by another magnet having its poles marked as the North Pole and the South Pole.
3. Hence, option (a) is the correct answer.

The explanation for incorrect options:

Option (b) Another magnet no matter whether the poles are marked or not

1. This option is incorrect.
2. Because if we do not know the poles of the new magnet, we will not be able to analyze the poles of the old magnet.

Option (c) Using an iron ba

1. When subjected to a magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, magnetizing the iron.
2. As a result, the two magnetic items become attracted to one another.
3. But it does not tell us anything about the poles of magnets, so this option is wrong.

Option (d) Using iron filings.

1. When we use iron fillings, it will align as shown in the image below.
2. 
3. So, it does not tell anything about the north and south poles of the magnet.
4. Hence, this option is also incorrect.

So, Option (A) is correct.