A 39.0−m length of coaxial cable has an inner conductor that has a diameter of 2.58 mm and carries a charge of 8.10μC. The surrounding conductor has an inner diameter of 7.27 mm and a charge of −8.10μC. Assume the region between the conductors is air.
(a) What is the capacitance of this cable? C= nF
(b) What is the potential difference between the two conductors? ΔV= kV

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