January 20, 2019

Charge Density Formula

The charge density is the measure of electric charge per unit area of a surface, or per unit volume of a body or field.

The charge density describes how much electric charge is accumulated in a particular field. Specifically, it finds the charge density per unit volume, surface area, and length.

The SI unit of Charge density is C.

Charge density formula is given by,

σ = q / A


q = electric charge

A = area

Similarly, the volume charge density is given by,

ρv = q / v


q = electric charge

v = volume in m3

The charge density in terms of electric field is given by,

ρ = ϵo / E


E = electric field

ϵo = permittivity


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