Three square metal plates A, B, and C, each 120 cm on a side and 1.50 mm

Question:

Three square metal plates A, B, and C, each 120 cm on a side and 1.50 mm thick, are arranged as in Fig. 24.43. The plates are separated by sheets of paper 0.45 mm thick and with dielectric constant 4.2. The outer plates are connected together and connected to point b. The inner plate is connected to point a.
(a) Copy the diagram and show by plus and minus signs the charge on the plates when point a is maintained at a positive potential relative to point b.
(b) What is the capacitance between points a and b?
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