a bar magnet has no markings to indicate its poles. how would you find out near which end is its North Pole located?
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Take the bar magnet and suspend it freely with help of a thread, the end that points towards north pole will be regarded as north end of the magnet. Take a bar magnet with known/marked poles on it. Let the north pole of the magnet be brought closer to the suspended magnet at the end that is pointing towards north, if it shows repulsion than it is confirmed.
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A freely suspended bar magnet always comes to rest in the North-South direction. The geographical North facing end of the magnet is its north pole and the geographical south facing end is its South pole. Hence, the unknown poles of a bar magnet can be marked by suspending it freely by a string.
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