Charge is a fundamental property that is exhibited by every matter in this universe. If we break a matter, and keep on breaking it, we get atoms; all objects or matter are formed by atoms. An atom is constructed with three basic particles: electrons, protons, and neutrons.
Electrons and protons have different masses. Electrons (â€˜eâ€™) are negatively charged, while protons are positively charged. In general, an atom consists of an equal number of electrons and protons in it. An electron has the charge -1.602 x 10â»Â¹â¹ C, while a proton has same, but opposite charge i.e. +1.602 x 10â»Â¹â¹ C. Since an atom has an equal amount of positive and negative charges, under normal conditions, it is neutral. There may be different conditions under which the charge imbalance can be created in an atom. One of the ways is through friction.
During the friction process, when we rub two objects together, electrons from one object leave their electronic orbit, and go to the other object. The atom from which the electrons leave will thus have an excess of protons, and excess of positive charges. The object receiving the electrons will have an excess of electrons, thus an excess of negative charge. However, in whatever way the charge is distributed among the two or more objects, the net amount of charge will always remain the same. That is why one concludes that the electric charge is conserved.
Subatomic particles carry electric charge. Electrons carry negative charge, and protons carry positive charge. Both the electrons and protons, along with the neutrons, exist inside an atom, where the proton and the neutron reside inside the nucleus of the atom, and the electrons orbit the nucleus. If the number of electrons in a matter is more than the number of protons, the object will carry a net negative charge, and if the number of protons in a matter is more than the number of electrons, it will carry a net positive charge. If both of them are present in equal number, then the object will be neutral.
Charge is also a quantized quantity. Any amount of charge present in a body will be integral multiple of some fixed amount of charge, called the elementary charge (e). The amount of charge of an electron, is considered to be elementary charge, having the value 1.602 x 10â»Â¹â¹ C. It is named elementary charge because this amount of charge can exist freely.
Whenever there is an electric charge, there will be an associated electric field, which is due to the subject matter of electrostatics. If a charge moves, it will have an associated magnetic field, which is the subject matter of magnetostatics. Both electrostatics and magnetostatics come under electrodynamics, and an electric field and a magnetic field produced by a moving charge is called electromagnetic field. This electromagnetic field exerts an electromagnetic force on other charged particles, which is one of the four fundamental forces in physics.
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