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In physics and engineering, a free body diagram ( FBD; also called a force diagram) [ 1] is a graphical illustration used to visualize the applied forces, moments, and resulting reactions on a body in a given condition. It depicts a body or connected bodies with all the applied forces and moments, and reactions, which act on the body (ies).
The law was first [ 1] formulated by Joseph-Louis Lagrange in 1773, [ 2] followed by Carl Friedrich Gauss in 1835, [ 3] both in the context of the attraction of ellipsoids. It is one of Maxwell's equations, which forms the basis of classical electrodynamics. [ note 1] Gauss's law can be used to derive Coulomb's law, [ 4] and vice versa.
The elementary charge, usually denoted by e, is a fundamental physical constant, defined as the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1 e. [ 2][ a] In the SI system of units, the value of the elementary charge is exactly ...
In electromagnetism, charge density is the amount of electric charge per unit length, surface area, or volume. Volume charge density (symbolized by the Greek letter ρ) is the quantity of charge per unit volume, measured in the SI system in coulombs per cubic meter (C⋅m −3 ), at any point in a volume. [ 1][ 2][ 3] Surface charge density (σ ...
Electric charge is a conserved property: the net charge of an isolated system, the quantity of positive charge minus the amount of negative charge, cannot change. Electric charge is carried by subatomic particles. In ordinary matter, negative charge is carried by electrons, and positive charge is carried by the protons in the nuclei of atoms.
In solid state physics, a charge carrier is a particle or quasiparticle that is free to move, carrying an electric charge, especially the particles that carry electric charges in electrical conductors. [ 1] Examples are electrons, ions and holes. [ 2] In a conducting medium, an electric field can exert force on these free particles, causing a ...
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