First slide
Nature of electromagnetic wave
Question

For plane electromagnetic waves propagating in the z direction, which one of the following combination gives the correct possible direction for E and Bfield respectively?

Moderate
Solution

E¯B¯  E¯.B¯=0-2i^-3j^.3i^-2j^=-6+6=0

E x B=i^j^k^-2-303-20

         =k^ 4+9=13k^ 

i.e., along z- axis E¯ x B¯C¯

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