[Eli5] What is electrical charge? Like, how do we know that electrons have a negative charge and what does that actually mean?
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The simplest answer is “we made it all up so we can call it what we like.” Positive and negative charge are just terms we gave to the behavior of particles under magnetic fields and when interacting with each other. Positive and negative repel like and attract opposite particles. If it doesn’t do either we call it neutral.
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