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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
You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them ?
Match the following
| Column A | Column B |
| A) Steel | 1) to store magnets |
| B) Soft iron | 2) temporary magnet |
| C) Use in electric bell | 3) permanent magnet |
| D) Magnetic keepers | 4) electromagnet |
Select the correct answer
An example of natural magnet is
Select the correct option:
The substance which form a strong temporary magnet is:
Define the following term:
Geographic meridian
Define the following term:
Angle of declination
Write a short note on lighting conductors.
Explain the following:
Resistance of a conductor
Observe the pictures A and B given in figure carefully.
Which of the following statement is correct for the above given pictures?
