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However, because the theory assumes that both types somehow cancel each other Official Trump Nazi Eagle America First shirt by tshirtat store, positive and negative seemed more apt monikers to attach to these charges. This is something important the charges being positive and negative didn’t necessarily have anything to do with the mathematical sense of positive and negative. It just turns out to be a convenient way to name them. Beyond this, there are no answers to your questions. Why do opposites attract? Well, they are the opposite because they attract. Had they also repelled, there would be no need for opposites. Similarly, if like charges also attracted, again we would not need to define like and opposite just like we don’t do this for mass. Other than that, the why as far as I know is unknown. Why does mass exist? Even if we were to answer this question with some theory, there would be a why question in that theory to answer which we would need another theory.
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This answer can be answered in two contexts Official Trump Nazi Eagle America First shirt by tshirtat store. One is the more familiar one, where the particle in the question means a macroscopic object that we know from our everyday experiences. An example would be a pebble, a grain of salt, or even a biological molecule. To see how these particles can be charged, it is useful to remind oneself that all entities are made of atoms, which are in turn made of electrons protons and neutrons. While neutrons have no charge, electrons and protons are oppositely charged. This means that if you put an equal number of protons and electrons in a molecule or a macroscopic particle, they will add to zero. This is the situation with all the neutral objects we know. When this balance is lost, either due to external or internal stimulation, the result is a charged particle.