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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?
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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