Answer: The inner cylinder of a long, cylindrical
Chapter 24, Problem 24.64(choose chapter or problem)
The inner cylinder of a long, cylindrical capacitor has radius ra and linear charge density +l. It is surrounded by a coaxial cylindrical conducting shell with inner radius rb and linear charge density -l (see Fig. 24.6). (a) What is the energy density in the region between the conductors at a distance r from the axis? (b) Integrate the energy density calculated in part (a) over the volume between the conductors in a length L of the capacitor to obtain the total electric-field energy per unit length. (c) Use Eq. (24.9) and the capacitance per unit length calculated in Example 24.4 (Section 24.1) to calculate U>L. Does your result agree with that obtained in part (b)?
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