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It has to do with entropy. The law of entropy states that the universe tends toward having the lowest possible energy at every point. Two oppositely charged particles' magnetic fields cancel out, so, to follow this tendency, they attract each other to have more of their fields overlapping, and so, reducing the energy at each point. Two electrons are samely charged, and so, when their fields overlap the energy of each field will add together. To keep with entropy, the particles repel so that less of their fields overlap, making the energy at each point as low as possible.

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15y ago

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