Question

1. Two conductors are held at a potential difference V and carry a current $I$. Calculate the power (energy per unit time), using Poynting's theorem, transported down the cables for the following two configurations: a. A long coaxial cable carries current $I$ (the current flows down the surface of the inner cylinder, radius $a$, and back along the outer cylinder, radius $b$) as shown in the figure below. V a b b. A transmission line is constructed from two thin metal \"ribbons\" of width $w$ a very small distance $h \ll w$ apart. The current travels down one strip and back along the other, and it spreads out uniformly over the surface of the ribbon, as shown in the figure below. W h V

          1. Two conductors are held at a potential difference V and carry a current $I$. Calculate the power
(energy per unit time), using Poynting's theorem, transported down the cables for the following
two configurations:
a. A long coaxial cable carries current $I$ (the current flows down the surface of the inner
cylinder, radius $a$, and back along the outer cylinder, radius $b$) as shown in the figure
below.
V
a b
b. A transmission line is constructed from two thin metal \"ribbons\" of width $w$ a very small
distance $h \ll w$ apart. The current travels down one strip and back along the other, and it
spreads out uniformly over the surface of the ribbon, as shown in the figure below.
W
h
V

1. Two conductors are held at a potential difference V and carry a current I. Calculate the power
(energy per unit time), using Poynting's theorem, transported down the cables for the following
two configurations:
a. A long coaxial cable carries current I (the current flows down the surface of the inner
cylinder, radius a, and back along the outer cylinder, radius b) as shown in the figure
below.
V
a b
b. A transmission line is constructed from two thin metal r̈ibbonsöf width w a very small
distance h ≪ w apart. The current travels down one strip and back along the other, and it
spreads out uniformly over the surface of the ribbon, as shown in the figure below.
W
h
V

Added by Trinidad C.

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