Answer:
It can found in following ways- (i) Suspend the bar magnet with marked poles freely using a stand and thread. (ii) Bring the another magnet slowly near the south pole of the suspended magnet. (iii) If the magnet attracts towards it, then it will be the north pole of another magnet and vice-versa. (iv) Repeat the same procedure with third magnet. Like poles repel each other while unlike poles attract.
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