Coulomb's law

An electric charge has its effect in a region or a space around it. This region is called an electric field of that charge. Such an electric field may be uniform or may be time varying. The charges, when placed near each other exert a force on each other due to their electric fields. It is well known that like charges repel while unlike charges attract each other. An engineer from the French Army Engineers, Colonel Charles Coulomb performed number of experiments and formulated a law in 1785, related to a force exerted by one charge on the other. This law is called Coulomb's law. A point charge means that electric charge whose geometrical dimensions are very very small. As it has been seen that the charge possessed by an electron can be treated to be a point charge as radius of an electron is very very small. The coulomb's law is related to the force between the two point charges.

The Coulomb's law states that the force between the two point charges Q1 and Q2

• It is inversely relative or proportional to the square of the space between them.
• It is directly proportional to the result or product of the Q1 Q2 two charges.
• Acts along the line linking the two point charges.

The electrical force, like gravitational force, decreases inversely as the square of the distance between charged bodies. This relationship was discovered by Charles Coulomb in the eighteenth century and is called Coulomb's law. It states that, for two charged substances which are very smaller than the distance between them,  then the force between the two substances or objects  differs directly  when the product of their charges  and inversely since the square of the parting distance.   Then the force acts with the straight line from one charged substances or object to another.

Questionnaire:

• Explain more about the Coulomb's law.