Coaxial cables used for cable television typically have a central metallic core of (0.20-mathrm{mm}) radius, surrounded by

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Coaxial cables used for cable television typically have a central metallic core of \(0.20-\mathrm{mm}\) radius, surrounded by a cylindrical metallic sheath of \(2.0-\mathrm{mm}\) radius. The two are separated by a plastic spacer. If the effect of the spacer can be ignored (that is, assuming the two conductors are separated by air), what is the capacitance of a 100 -m-long cable?

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