An electron is briefly accelerated in the direction shown in the figure below and to the left. It creates an EM wave pulse that eventually reaches points $P$ and $S$

Choose answers to the following questions from the possibilities shown above. (When using the letters on the book's back, you can display a double-letter answer by pointing two fingers at a letter.)
-(c) What is the direction of $\vec{B}$ in the wave as it passes $P$ ?
A) A
B) B
C) C
D) D
E) Toward the viewer.
F) Away from the viewer. $T$. The vector is zero.
G) AA
H) BB
I) CC
J) DD

Question

An electron is briefly accelerated in the direction shown in the figure below and to the left. It creates an EM wave pulse that eventually reaches points $P$ and $S$
  
Choose answers to the following questions from the possibilities shown above. (When using the letters on the book's back, you can display a double-letter answer by pointing two fingers at a letter.)
-(c) What is the direction of $\vec{B}$ in the wave as it passes $P$ ?
A) A 
B) B 
C) C 
D) D 
E) Toward the viewer. 
F) Away from the viewer. $T$. The vector is zero. 
G) AA 
H) BB 
I) CC 
J) DD

Quizplus · Accepted Answer

The direction of the magnetic field $\vec{B}$ in an electromagnetic wave is perpendicular to both the electric field $\vec{E}$ and the direction of wave propagation. If the wave is moving in the positive x-direction and $\vec{E}$ is in the y-direction, then $\vec{B}$ would be in the z-direction, which could be either toward or away from the viewer.

An Electron Is Briefly Accelerated in the Direction Shown in the Figure