The concept of electric charge is not a self-made concept by scientists; rather, it is a fundamental property of particles. Electric charge is a physical property of matter that determines how it interacts with electric and magnetic fields.
Experimental observations have shown that certain particles, such as electrons and protons, exhibit electric charge. The charge of an electron is considered negative, while the charge of a proton is positive. The unit of electric charge is the elementary charge, denoted as "e," which is the charge of a single proton or electron.
Electric charge plays a crucial role in the behavior and interactions of particles. Charged particles can attract or repel each other through electric forces, and they can also experience the effects of electric and magnetic fields. These phenomena have been extensively studied and confirmed through numerous experiments and observations.
So, in summary, electric charge is not just a concept but a real physical property that is intrinsic to certain particles, and it has been extensively studied and understood through experimental evidence and theoretical frameworks such as electromagnetism.