question_answer

Light wave is travelling along y-direction. If the corresponding E vector at any time is along the x-axis, the direction of B vector at the time is along

A)  y-axis                          

B)  x-axis

C)  +z-axis                                    

D)  -z-axis   

Correct Answer: D

Solution :

The given wave is an electromagnetic wave. Electromagnetic radiation is a self-propagating wave in space with electric and magnetic components. These components oscillate at right angle to each other and to the direction of propagation, i.e. wave is travelling along \[E\times B\] Hence B is along the -z axis at that time