A capacitor is made with two strips of metal foil, each 2.5 cm wide by 50 cm long, with a 0.70-
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5 cm, length = 50 cm Area = width x length = 2.5 cm x 50 cm = 125 cm² = 125 x 10^-4 m² Show more…
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A capacitor is made with two strips of metal foil, 2.5 cm wide by 50 cm long, with a 0.70-ÎĽm thick strip of paper (dielectric constant k = 4.7) sandwiched between them. What is the capacitance of this device?
Madhur L.
A 64.7 µF capacitor is made from two long strips of metal foil sandwiched between two long strips of waxed paper. The whole thing is then rolled up into a compact cylinder. The foil and paper are 26.6 mm wide. The paper is 0.9 micrometers thick and has a dielectric constant of 3.42. The foil is 4 micrometers thick. How long, in meters, must the paper and foil strip be? Note that rolling a capacitor in this way doubles the capacitance, since there are twice as many gaps, and charge resides on both sides of each piece of foil. (A micron is another name for a micrometer.)
Adi S.
A commercial capacitor is to be constructed as shown in Figure 26.15 $\mathrm{a}$ . This particular capacitor is made from two strips of aluminum separated by a strip of paraffin-coated paper. Each strip of foil and paper is 7.00 $\mathrm{cm}$ wide. The foil is 0.00400 $\mathrm{mm}$ thick, and the paper is 0.0250 $\mathrm{mm}$ thick and has a dielectric constant of $3.70 .$ What length should the strips have if a capacitance of $9.50 \times 10^{-8} \mathrm{F}$ 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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