Two large charged sheets are placed a distance D apart. The top sheet has uniform sur- face charge density + while the bottom sheet has uniform charge density -20. The sheets are large compared to their separation. Uniformly charged plates XB +0 D -20 a) What direction is the electric field at point A? Justify your answer. b) At which point, A or B, is the strength of the electric field greater? Explain your reasoning. c) If the bottom plate were suddenly removed, would the direction and the magnitude of the electric field at point A change? Explain your reasoning.