A monochromatic beam of light has a frequency Hz and is propagating along the direction It is polarized along the direction. Then acceptable form for the magnetic field is :
As we learned
Poynting Vector -
It is total energy flowing perpendicularly per second per unit area into the surface in free space.
should give a direction of wave propagation
option (2) and (4) does not satisfy this wave propagation vector should be along
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