The fact that the electron has a negative charge and the proton has a positive charge is due to a convention established by Benjamin Franklin. Would there have been any significant consequences if Franklin had chosen the opposite convention? Is there any advantage to naming charges plus and minus as opposed to, say, A and B?
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Here we need to explain if the convention of charges like Positive for proton and negative for electron is interchanged for convection, will this has any effect.
There will be no effect, as the net charge of the universe remains same. The change in the convention, will also ensures that the charge of the universe is conserved.