Figure 1 shows a configuration of a flat plane and an arbitrary shape, both carrying surface charge density of magnitude σ. The arrows show the electric field lines. Are the statements below true or false? a) The flat plane is carrying a negative surface charge density −σ and the arbitrary shape is carrying a positive surface charge density +σ. Justify your answer. b) Both surfaces are equipotential surfaces. Justify your answer.

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The picture on the right shows a plate capacitor. You may assume that the two plates are very large compared to the separation between the plates (i.e. you may treat them as 'infinite' planes). The plates are charged to ±Q, each plate has an area of A, and the plates are separated by a distance d. The x-axis in this problem is pointing from the negative to the positive plate, with the origin at the negative plate. The electric field at point 2 has a magnitude of E. E=3000 A=1 m² d = 8 mm c. What is the electric field strength at point 1? d. What is the charge Q on the plates? ·area A IT +Q €0=8.85 x 10-12 -a X=0 e. What is the electric field strength at point 3? Part A: a. In the picture, sketch the electric field between the plates by drawing the field lines. b. Find the surface charge density n on each plate. Nm² 12 x(mm)