So you can see two facts: If we re-designate all positive electric charges as negative and vice versa, while keeping their absolute value, the resulting physics would be the same.

All particles seems to be grouped under two distinct polarities based on the manner of attraction or repulsion. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.

Home Questions Tags Users Unanswered. WHY questions in physics on fundamental definitions end up on the postulates and laws which have to be assumed so that a mathematical model fits existing data and predicts new observations. We need to build the theory with these properties.

Sign In. The much more important fact is that there are two different polarities of charges which exist in equal numbers.

The most convenient label is positive and negative that has some mathematical advantages. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service.

One of the implicit postulates from data is the existence of two opposite charges. Institutional Sign In. Electron emission and concomitant charge accumulation near the surface of insulators is central to understanding spacecraft charging.

SchrodingersCat 3,515 3 12 38. Great overall question!

## What is Electricity?

Evolution of total, backscattered, and secondary yield results over a broad range of incident energies are presented for two representative insulators, Kapton and Al 2 O 3.

Physics Stack Exchange works best with JavaScript enabled. It is found that all charges of the same type repel each other, while charges of different types attract each other.

Nobody has yet defined the actual meaning of a charge, or why a negative charge is different from a positive charge.

Related 1. The postulates and laws have been chosen for the mathematical model as extra axioms BECAUSE they constrain the mathematics to observations and correct predictions.

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