Physics

Electric Field - Physics Class 12

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 - Physics Class 12

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

Principle of superposition -Physics Class 12

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

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