Electromagnetic WavesMedium
Question
If the magnetic field of a light wave oscillates parallel to y-axis and is given by By = Bm sin (kz - ωt), The direction of a wave travel and the axis along which the electric vector oscillates is :
Options
A.+ ve y - axis, z-axis
B.-ve z -axis, x - axis
C.-ve x -axis, y-axis
D.-ve x -axis, z-axis
Solution
Give By = Bm sin(kz - ωt). According to this equation the direction of propagation is along z axis. The direction of election vector must be perpendicular both y and z-axis. So it is along x-axis.
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