Four parallel infinite sheets of charge spaced by 4 cm between adjacent sheets are shown edgewise in the figure. Their charge densities are as indicated with σ = 2.0 μC/m2. What is the magnitude of the electric field at point P midway between two sheets as shown?
(1) 4.5 × 105 N/C
(2) 2.3 × 105 N/C
(3) 1.13 × 105 N/C
(4) 9.0 × 105 N/C
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