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a)
FIGURE 4.26

A coaxial cable consists of a copper wire, radius a surrounded by a concentric copper
tube of inner radius c (Fig. 4.26). The space between the two conductors is partially
filled (from radius b to radius c) with a linear dielectric material of dielectric constant
Er. The gap from a to b has permittivity 6o.
Find the capacitance per unit length of this cable.

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