74. We first need to find an expression for the energy stored in a cylinder of radius Rand length L, whose surface lies between the inner and outer cylinders of the capacitor (a < R < b). The energy density at any point is given by uE=1202ε, where Eis the magnitude of the electric field at that point. If qis the charge on the surface of the inner cylinder, then the magnitude of the electric field at a point a distance rfrom the cylinder axis is given by EqLr=20π(see Eq. 25-12), and the energy density at that point is given by qLr==
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Fundamental physics concepts, Energy density, 0 l