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Solved Problems-9

Problem-9
Calculate the power flow for a plane wave using the Poynting theorem.
Solution
Velocity of a uniform plane wave, Description: 40065.png
 
The total energy density due to electric and magnetic fields is given by Description: 40055.png
 
Rate of flow of energy per unit area,
 
Description: 40046.png
 
Since the angle between Description: 40038.png and Description: 40029.png is 90°, the power flow can be written as,
 
 
Description: 40020.png
 





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