Q- A commercial capacitor is to be constructed as shown in Figure. This particular capacitor is made from two strips of aluminum foil separated by a strip of paraffin-coated paper. Each strip of foil and paper is 7.90 cm wide. The foil is 0.00400 mm thick, and the paper is 0.0250 mm thick and has a dielectric constant of 4.60. What length should the strips have if a capacitance of 9.50*10-8 F is desired before the capacitor is rolled up? (Adding a second strip of paper and rolling the capacitor effectively doubles its capacitance by allowing charge storage on both sides of each strip of foil.)
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