What surface charge density on an infinite sheet will produce an electric field of 1.4 kN/C? Express your answer in coulombs per meter squared.

Answer: σ = 2.47 * 10^-8 q/m²

Explanation: The electric field intensity and surface charge density for an infinite sheet is given as

E = σ/2ε₀

Where E = 1.4KN/c = 1400 N/c

ε₀ = permittivity of free space = 8.85*10^-12

σ = surface charge density

1400 = σ/2*8.85*10^-12

σ = 1400 * 2 * 8.85*10^-12

σ = 24780*10^-12

σ = 2.47 * 10^-8 q/m²