Question

why a magnet have only 2 poles... please explain

Answer 1

The opposite poles of two magnets attract. Therefore, when the red end of a magnet or compass is pointing north, it is because it is being attracted in that direction by the south end of another magnet (often coloured blue) – this is the imaginary magnet inside the Earth.

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Answer 2

only bar magnet or a solenoid have two poles rest , others have no specified poles / they may work irregularly or their polarity may change