For a certain electromagnetic wave in a vacuum,at one instant the $\vec { E }$ field vector points in the +z direction while the $\vec { B }$ field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling?
A)+x
B)-x
C)+y
D)-y
E)+z

Question

For a certain electromagnetic wave in a vacuum,at one instant the $\vec { E }$ field vector points in the +z direction while the $\vec { B }$ field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling? 
A)+x 
B)-x 
C)+y 
D)-y 
E)+z

Quizplus · Accepted Answer

According to the right-hand rule, the direction of propagation of the electromagnetic wave is perpendicular to both the $\vec{E}$ and $\vec{B}$ field vectors, which in this case is in the +y direction.

For a Certain Electromagnetic Wave in a Vacuum,at One Instant E⃗\vec { E }E

For a Certain Electromagnetic Wave in a Vacuum,at One Instant $\vec { E }$