A) does not change with time
B) varies periodically with time
C) increases and decrease linearly with time
D) is parallel to the direction of propagation
Correct Answer: B
Solution :
Light can be represented as a transverse electromagnetic wave made up of mutually perpendicular fluctuating electric and magnetic fields. The diagram shows the electric field in the xy-plane, the magnetic field in xz-plane and the propagation of the wave in the x-direction.
Fig. 1 Fig. 2 Fig. shows a line tracing out the electric field vector as it propagates traditionally, only the electric field vector is dealt with because the magnetic field component is essentially the same.
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