b. Three identical looking bars are kept on the table. One out of three is
a magnet and rest are iron bars. How will you identify the one magnet
without the help of any other magnet?
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Take the magnet with North-South poles marked. Keep it close with both the iron bars, and both will be attracted to it as both are magnetic. So test each of the two magnet bars one by one for repulsion test. If the first bar you took, repulses the marked magnet bar then it is the second magnet bar.
The magnets attract and repel both, while iron only attracts.
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