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प्रश्न
Describe the method by which an iron bar can be made a magnet.
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उत्तर
Single touch method: Place the iron bar (or the needle) AB on a table. Take a bar magnet NS and place it almost vertical with its north pole (N) on the end A of the bar.
Move the magnet along tire iron bar till the other end B is reached.
Lift the magnet at the end B and again place it on the first end 'A' as shown by the arrows in the diagram. Again, stroke the bar. Repeat the process about 20 times. Then turn the iron bar AB upside down. Again, stroke it with the magnet about 20 times. The bar now becomes a magnet.
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संबंधित प्रश्न
Write true or false of the following statement.
Permanent magnets get easily demagnetised.
Select the correct answer
The artificial magnet used to detect direction in the laboratory is
Tick the most appropriate answer.
A permanent magnet can be demagnetized by
Fill in the blank.
Permanent magnets are generally made of steel, cobalt, nickel, or an alloy called ...............
State if the following statement is true or false. Correct the statement if it is false.
Temporary magnets are made of cobalt.
Give a reason for the following.
Electromagnets are temporary magnets.
Answer the following in detail.
Distinguish between a temporary magnet and a permanent magnet.
Write true or false of the following statement.
Single touch method is better than the electrical method for making a magnet.
Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
| Column I | Column II |
| N - N | ______ |
| N - ______ | Attraction |
| S - N | ______ |
| ______ - S | Repulsion |
You are given an iron strip. How will you make it into a magnet?
