If the universe consist of only two particles namely electron and proton, and if they are separated away by huge distance, they will still attract each other.
Can we prove it without using Coulomb's law?
Can we find out why they attract or what causes them to attract?
What really happens there that makes the both particles move towards each other?
Answer
Physics does not answer why questions, except with how from postulates and mathematical models one can describe the data. The how is Coulombs law.
Physics is about fitting experimental observations with mathematical models. The answer to the "why attraction" in this case, is, data dictates so. There is no other answer except that Coulomb's law fits the data. Our present theories of physics incorporate this law in more inclusive mathematical models, because of this experimental fact.
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