Question

why like poles repel and unlike poles attract?

Answer 1

when two magnets are placed with their like poles facing each other the lines of force are in opposite direction and

hence like poles repel each other

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when the unlike poles of a bar magnet face each other the magnetic lines of force are in the same direction and hands and

hence unlike poles attract each other....

Answer 2

because according to polarity of it which causes some force hence dislike force are attractive and like poles are repulsive