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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
What is a magnet?
Draw diagrams of the artificial magnets of four different shapes?
What is the magnetic induction? Explain with the help of a diagram.
Answer the following.
Why is it not possible to isolate a single magnetic pole?
Answer the following in short.
What is a magnet? Differentiate between natural and artificial magnets.
Answer the following in detail.
List four methods of magnetizing a magnetic substance.
If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ______ bar magnets are formed, and a total of _____ poles are formed.
Draw the magnetic flux pattern near a bar magnet placed with its axis in the magnetic meridian and the south pole pointing towards geographic north.
Explain the following:
Resistance of a conductor
The magnetic poles always exist in pairs.
