Chapter 22, Problem 22.30E

Two very large, nonconducting plastic sheets, each 10.0 cm thick, carry uniform charge densities σ₁, σ₂, σ₃, and σ₄ on their surfaces (Fig. E22.30). These surface charge densities have the values σ₁ = −6.00 μC/m², σ₂ = +5.00 μC/m², σ₃ = +2.00 μC/m², and σ₄ = +4.00 μC/m². Use Gauss’s law to find the magnitude and direction of the electric field at the following points, far from the edges of these sheets: (a) point A, 5.00 cm from the left face of the left-hand sheet; (b) point B, 1.25 cm from the inner surface of the right-hand sheet; (c) point C, in the middle I of the right-hand sheet.