# Charge Density | Linear, Surface, Volume

## Charge Density-

The electric charges may be distributed on extended or continuous bodies.

 The electric charge distributed per unit dimension (length, area or volume) is called as charge density.

### Types of Charge Densities-

There can be three types of charge densities-

1. Linear charge density
2. Surface charge density
3. Volume charge density

### 1. Linear Charge Density-

The electric charge distributed per unit length is called as linear charge density. It is denoted by λ.

If charge Q is distributed over a thin wire of length L, then its linear charge density is given by-

• Its SI unit is coulomb per meter denoted as Cm-1.
• Its dimensional formula is [M0L-1T1A1].

### 2. Surface Charge Density-

The electric charge distributed per unit area is called as surface charge density. It is denoted by σ.

If charge Q is distributed over a surface of area A, then its surface charge density is given by-

• Its SI unit is coulomb per square meter denoted as Cm-2.
• Its dimensional formula is [M0L-2T1A1].

### 3. Volume Charge Density-

The electric charge distributed per unit volume is called as volume charge density. It is denoted by ρ.

If charge Q is distributed over a volume V, then its volume charge density is given by-

• Its SI unit is coulomb per cubic meter denoted as Cm-3.
• Its dimensional formula is [M0L-3T1A1].