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प्रश्न
There are two knitting needles. One of them is magnetized. How will you find out which one is magnetized, if no other magnet is available?
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उत्तर
When an iron bar is magnetized, it slightly increases in length due to the setting of molecular magnets along straight chains. So, on precisely measuring the length of the knitting needle, the knitting needle which is slightly longer in length than the other is magnetized.
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संबंधित प्रश्न
Define the following term regarding a bar magnet:
Magnetic field
If a magnet attracts a piece of metal, that piece must be made of ______.
Distinguish between the two methods of making artificial magnets.
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Name the metal used for E and F.
Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.
Give scientific reason:
Not attraction but repulsion is a sure test of magnetism.
Write a short note on lighting conductors.
Consider the statement given below and choose the correct option.
Assertion: Iron filings are concentrated more at the magnetic poles.
Reason: The magnets are so sharp.
What are the factors that determine the strength of the magnet?
