Question: E 1 8 D . 3 The Poynting vector vec ( S ) for an electromagnetic wave has a direction equal to the wave's direction

E18D.3 The Poynting vector vec(S) for an electromagnetic wave has a direction equal to the wave's direction of travel and a magnitude equal to the wave's intensity. Show that
vec(S)=c0vec(E)vec(B)
(E18.20)
E 1 8 D . 3 The Poynting vector vec ( S ) for an

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