A cable is made from two coaxial cylindrical shells The outer shell has radius b and charge per unit length , and carries a longitudinal current I The inner cylinder has radius a b and charge per unit length , and carries the current I back in the opposite direction (a) Integrate the Poynting vector to find the rate at which energy flows through a cross section of the cable (b) Show that a resistor R connected between the cylinders dissipates the power calculated in (a) R 1 2 Z

Question: A cable is made from two coaxial cylindrical shells. The outer shell has radius b and charge per unit length , and carries a longitudinal

A cable is made from two coaxial cylindrical shells. The outer shell has radius b and charge per unit length λ, and carries a longitudinal current I. The inner cylinder has radius a

(a) Integrate the Poynting vector to find the rate at which energy flows through a cross section of the cable.
(b) Show that a resistor R connected between the cylinders dissipates the power calculated in (a).

/R 1 2 -^ ... Z

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