Discussion
Match the region with the character of the Poynting vector there.
1. Inside a current-carrying wire 2. Dielectric of a coaxial cable 3. Far field of an antenna
P. Axial, carrying the load power Q. Radially inward, equal to the ohmic loss R. Radially outward, falling as the inverse square
Answer: B
Correct answer: 1-Q, 2-P, 3-R
Three regions, three characters. Inside a current-carrying wire the vector points radially inward and its surface integral equals the ohmic loss. In a coaxial cable the vector is axial in the dielectric, carrying the load power along between the conductors rather than inside them. In the far field it is radially outward and falls as the inverse square, since the same power spreads over a growing sphere.
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