Exponential screening of a test charge's potential by the surrounding plasma over a distance ~λ_D: φ(r) = (q/4πε₀r) e^{−r/λ_D}.
Exponential screening of a test charge's potential by the surrounding plasma over a distance ~λ_D: φ(r) = (q/4πε₀r) e^{−r/λ_D}.