**CHARGE DISTRIBUTIONS**

There are three types of charge distributions :

a) **Linear Charge Distribution.** In this distribution the charge is distributed uniformly along a line in a straight line or circumference of a circle. This is represented by λ, the linear density of charge, which is equal to charge per unit length.

λ =dq/dl

Where dq is a small amount of charge in small length dl.

It is measured in C/m.

b) **Surface Charge Distribution.** In this distribution the charge is distributed continuously over some area. This is represented by σ, the surface density of charge, which is equal to charge per unit area.

σ = dq/dS

where dq is a small amount of charge in small area dS.

It is measured in C/m^{2}.

c) **Volume Charge Distribution.** In this distribution the charge is continuously distributed over a volume, for example a sphere or a cube. It is represented by ρ.

The volume density of charge which is equal to charge per unit volume.

Ρ = dq/dV

Where dq is a small amount of charge in small volume dV.

It is measured in C/m^{3}.

**Point Charge :**

Any charge which covers a space with dimensions much less than its

distance from an observation point can be taken as a point charge.