A commercial capacitor is to be constructed as shown in Figure P26.46. 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 w =
wide. The foil is t =
thick, and the paper is d =
thick and has a dielectric constant k =
. What length should the strips have if a capacitance c =
is desired before the capacitor is rolled up? Adding a second strip of paper and rolling the capacitor would effectively double its capacitance by allowing charge storage on both sides of each strip of foil.