Unformatted text preview: 26. According to Eq. 24-13 the electric ﬁeld due to either sheet of charge with surface charge density σ is
perpendicular to the plane of the sheet (pointing away from the sheet if the charge is positive) and has
magnitude E = σ/2ε0 . Using the superposition principle, we conclude:
(a) E = σ/ε0 , pointing up;
(b) E = 0;
(c) and, E = σ/ε0 , pointing down. ...
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