A coaxial cable consists of a wire of radius 0.30 mm and an outer conducting shell of radius 1.0 mm.Its capacitance per unit length is approximately
A)17 nF/m
B)0.11 nF/m
C)92 pF/m
D)23 pF/m
E)46 pF/m

Question

Quizplus · Accepted Answer

The capacitance per unit length of a coaxial cable is given by the formula C = (2πε₀ε_r)/(ln(b/a)), where ε₀ is the permittivity of free space, ε_r is the relative permittivity of the dielectric, a is the radius of the inner conductor, and b is the radius of the outer conductor. Assuming ε_r = 1 (for air), and using the given radii, the calculation yields approximately 46 pF/m.

A Coaxial Cable Consists of a Wire of Radius 0