p240+feb+6+discussion++problems

# p240+feb+6+discussion++problems - 24.34 A capacitor is...

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24.34 A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has a radius 12.5 cm , and the outer sphere has a radius 14.8 cm . A potential difference of 120 V is applied to the capacitor. (a) What is the energy density at r = 12.6 cm , just outside the inner sphere? (b) What is the energy density at r = 14.7 cm , just inside the outer sphere? (c) For a parallel-plate capacitor, the energy density is uniform in the region between the plates, except near the edges of the plates. Is that also true for a spherical capacitor?

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24.38 A building electronics hobbyist wants to make a simple 1.0- nF capacitor for tuning her crystal radio, using two sheets of aluminum foil as plates, with a few sheets of paper between them as a dielectric. The paper has a dielectric constant of 3.0, and the thickness of one sheet of it is 0.20 mm . (a) If the sheets of paper measure 22 × 28 cm and she cuts the aluminum foil to the same dimensions, how many sheets of paper should she use between her
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p240+feb+6+discussion++problems - 24.34 A capacitor is...

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