Coloumb's Law

Coloumb's Law

Coloumb's Law states that the Electric Force (F_e) between two charges, q₁ and q₂, separated by distance, r, is:

F_e = q₁q₂/4πε₀r²

where ε₀ is the Permittivity of Free Space

Otherwise stated, a charge in free space generates a spherical Electric Field:

∇ • E = ρ/ε₀ → Coloumb's Law

where E is the Electric Field and ρ is the charge density. Note that Coloumb's Law applies whether the charge density is consolidated or distributed such as in a wire, moving or stationary. Moving charge is called a current. Note further that like charges repel while opposites attract! [NS] {NR}