Electric Field—
The electric field due to a charge is the space around the charge in which it exerts an electrostatic force on any other charge.
Electric Field Intensity—
The electric field intensity at a point due to a source charge may be defined as the force experienced per unit positive test charge placed at that point without disturbing the source charge.
Continuous Distribution of Charges--
When we consider the charged body of reasonable size, charge has continuous distribution. The continuous distribution of charge may be of one dimensional, two or three dimensional.
Linear Charge Density--
When charge is distributed along a line, the distribution is called linear.
If Charge q is distributed over the length L, then
Linear charge density(λ) =q/l
Surface Charge Density--
When charge is distributed over the entire surface, the
Definition of One Coulomb- One coulomb is that charge which repels an equal and similar charge with a force 9x109 N, when placed in vacuum(or air) at a distance of one meter from it.
1C= 3x109 stat C
Principle of superposition--
It states that when a number of charges are interacting,
total force on a given charge is the vector sum of the
individual forces exerted on the given charge by all
the other charges. The force between any two charges
Coulomb's law in electrostatics--
It states that two point charges attract or repel each other with a force which is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them.