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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.
Artificial magnets are weaker than the natural magnets.
Fill in the blank.
Temporary magnets are usually made up of .................
Select the correct answer
Making a magnetic substance a magnet by bringing it closer to another magnet without touching it, is
State three differences between the temporary and permanent magnets.
Tick the most appropriate answer.
Temporary magnets are made of
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.
Answer the following in detail.
Distinguish between a temporary magnet and a permanent magnet.
It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.
