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You are given a magnetised bar and a com...

You are given a magnetised bar and a compass needle. How will you mark polartiy at the ends of the bar ?

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The two ends of bar are brought near the north pole of the compass needle one by one. The end of bar which repels the north pole of the compass needle will be the north pole, while the end of the bar which attracts the north pole of the compass needle will be the south pole.
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