A magnet is a metal that has a positively charged magnetic field on one of its ends, and a negatively charged magnetic field on the other end due to negatively charged electrons allocating on one of its ends.
What we know is that like charges repel each other and opposite charges attract each other. Hence, when an area of high electron density (negative charge) is brought close to another area of high electron density, there is a repulsion force repelling each other away. When an area of high electron density is brought near an area of low electron density (more protons in the area than electrons, resulting in a positive charge), there is a force of attraction from the opposite charges. And finally, when two areas of low electron density (positive charge) are brought close, they repel each other, as protons are electrostatically attracted to negatively charged electrons instead.
Hence, when two magnets are brought close to each other with one magnet's positively charged end facing the other's negatively charged end (opposite poles), an attractive magnetic force pushes the magnets closer to each other. In contrast, when both positively charged or both negatively charged ends of the magnets (like poles) are brought close to each other, there is a repulsive magnetic force, pulling the magnets away from each other.
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