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B1. The energy flow rate (power per unit area) in an electromagnetic wave in vacuum is given by the Poynting
vector S=-
EXB. The magnitude of the time-averaged value of S is called the intensity I=Sy . Calculate
the intensity of a sinusoidal plane electromagnetic wave traveling in vacuum in the +x -direction, described by
E (x,t)=ŷ Emax Cos(kx-wt)
B(x,t)=î B,
cos (kx – wt)
max
E max=cBmax

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