Coulomb's law is a law of physics describing the electrostatic interaction between electrically charged particles. Was formulated and first published in by French physicist Charles Augustin de Coulomb and was essential to the development of the study of electricity. This law states that the magnitude of the force between two punctate electrical charges ( and ) is directly proportional to the product of the absolute values (modules) of the two charges and inversely proportional to the square of the distance r between them. This force can be attractive or repulsive depending on the sign of the charges. It is attractive if the charges have opposite signs. It is repulsive if the charges have the same sign.
Diagram depicting the basic mechanism of Coulomb's law. The like charges repel and opposite charges attract Once detailed measurements using a torsion balance, concluded that the Coulomb force is fully described by the following equation:
Is the Force In Newtons
Is the Permittivity of free space
Is the Distance between the Two Point charges in Meters and and , respective load values in Coulombs .
Is the Vector that Indicates the Direction in Which the Electric Force points.
Sometimes it replaces the factor by , Coulomb's Constant, with
The previous notation is a compact vector notation, which is not specified any coordinate system. If the load is the source and the load at point with Cartesian coordinates the Coulomb force takes the form:
How to charge a Coulomb (C 1) is very large, it is customary to use submultiples of this unit. Thus we have:
Remembering that Electrons
Two particles of electric charges
vacuum are separated by a distance of .
Where , the intensity of the force of interaction between them, in newtons, Is :
You Can Watch these Videos for See More Examples: