Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber, could be rubbed with cat's fur to … See more

Coulomb's law can be stated as a simple mathematical expression. The scalar form gives the magnitude of the vector of the electrostatic force F between two point charges q1 and q2, but not its direction. If r is the dista… See more

Coulomb's law in vector form states that the electrostatic force experienced by a charge, at position , in the vicinity of another charge, at position , in a vacuum is equal to
where is the displacement vector between the charges, … See more

The Coulomb constant is a proportionality factor that appears in Coulomb's law and related formulas. Denoted , it is also called the electric force constant or electrostatic constant hence the subscript 'e'. The Coulomb c… See more

There are three conditions to be fulfilled for the validity of Coulomb's inverse square law:
1. The charges must have a spherically symmetric distribution (e.g. be point charges, o… See more

An electric field is a vector field that associates to each point in space the Coulomb force experienced by a unit test charge. The strength and direction of the Coulomb force on a charge depends on the electric field established … See more

Coulomb's law holds even within atoms, correctly describing the force between the positively charged atomic nucleus and each of the negatively charged electrons. This simple law also correctly accounts for the forces that … See more