Find the mean Poynting vector s of a plane electromagnetic wave E = E m cos( w t – kr ), if the wave propagates in vacuum :

Find the mean Poynting vector s of a plane electromagnetic wave E = E m cos( w t – kr )…

Physics · NEET · NTA Exams — Electromagnetic Waves

Find the mean Poynting vector \(\langle s\rangle\) of a plane electromagnetic wave E = E_mcos(wt – kr), if the wave propagates in vacuum :

\(\frac{\partial B}{\partial x}=\frac{1}{c^{2}} \frac{\partial E}{\partial t}\)
\(\frac{\partial E}{\partial t}=\frac{1}{c^{2}} \frac{\partial B}{\partial x}\)
\(\frac{\partial B}{\partial x}=\frac{1}{c^{2}} \frac{\partial E}{\partial t}\)
\(\frac{\partial E}{\partial t}=-\frac{1}{c^{2}} \frac{\partial B}{\partial x}\)

(B) E t = 1 c^ 2 B x

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