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Em-e. An EM wave propagating in vacuum, with electric field amplitude Eo > 0 and magnetic field amplitude Bo > 0, has wavenumber k and angular frequency w. The following is a list of possible pairs of the electric (E) and magnetic fields (B): 1. E= = Eo cos(kz+wt)k, B = Bo cos(kz+wt) j II. E = E cos(ky - wt)k, B = Bo cos(ky – wt) i III. Ē =-Eo cos(kx+wt) j, B = − B₁ cos(kx + wt) k. Which among the choices below correspond to a physically realizable EM wave? 6 O A. I only O B. II only O C. II and III only O D. III only
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Transcribed Image Text:Em-e. An EM wave propagating in vacuum, with electric field amplitude Eo > 0 and magnetic field amplitude Bo > 0, has wavenumber k and angular frequency w. The following is a list of possible pairs of the electric (E) and magnetic fields (B): 1. E= = Eo cos(kz+wt)k, B = Bo cos(kz+wt) j II. E = E cos(ky - wt)k, B = Bo cos(ky – wt) i III. Ē =-Eo cos(kx+wt) j, B = − B₁ cos(kx + wt) k. Which among the choices below correspond to a physically realizable EM wave? 6 O A. I only O B. II only O C. II and III only O D. III only
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