Question

What are the characteristics of coulombian force?

Answer 1

Hint: Coulombian forces are the forces which work on charges. These are the attractive or repulsive forces between the charges on their field. It acts along the line joining the two points. It was proposed by Charles Coulomb, so it is known as the coulombian force.

Complete step by step answer:
In 1785 Charles Coulomb experimentally established the fundamental law of electric force between two stationary charged particles. He observed that an electric force between two charge particles share the following properties:
1. It is directed along a line joining the two particles and is inversely proportional to the square of the separation distance $r$, between them.
2. It is proportional to the product of the magnitudes of the charges, $\left| {{q_1}} \right|$ and $\left| {{q_2}} \right|$ of the two particles.
3. It is attractive if the charges are of opposite sign and repulsive if the charges have the same sign.

From these observations, Coulomb proposed the following mathematical form for the electric force between two charges. The magnitude of the electric force $F$ between charges ${q_1}$ and ${q_2}$ separated by a distance $r$ is given by,
$F = k\dfrac{{{q_1}{q_2}}}{{{r^2}}}$
where $k = \dfrac{1}{{4\pi {\varepsilon _0}}}$, also known as coulomb constant.
The SI unit of electric force is Newton (N). The SI unit of force is always Newton

Note: It must be noted that the electric force between two charges are always conservative in nature and medium dependent. The force between two charged particles is a central force. For a coulombian force, there must be two e available, only one charged particle does not experience Coulomb Force.