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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
Match the following
| Column A | Column B |
| (a). Human body | (1). electric bell |
| (b). Silk thread | (2). current |
| (c). Charge in motion | (3). conductor |
| (d). soft iron | (4). electromagnet |
| (e) . Electromagnet | (5). insulator |
You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them ?
Explain the meaning of the term 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.
Select the correct option:
The substance which form a strong temporary magnet is:
Bar magnets are often stored in pairs as shown in the figure. E and F being pieces of metal.
Mark on the diagram the poles of the second magnet,
Define the term Effective length of a magnet
Distinguish between
Natural and artificial magnets.
The strongest natural magnet is ______.
