Question: Two horizontal, infinite, plane sheets of charge are separated by a distance d. The lower sheet has negative charge with uniform surface charge density -

Two horizontal, infinite, plane sheets of charge are separated by a distance d. The lower sheet has negative charge with uniform surface charge density - σ < 0. The upper sheet has positive charge with uniform surface charge density σ > 0. What is the electric field (magnitude, and direction if the field is nonzero?)
(a) Above the upper sheet,
(b) Below the lower sheet,
(c) Between the sheets?

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