Chapter 25 - Electromagnetic Waves - Problems and Conceptual Exercises - Page 900: 9

case 1, positive x direction case 2, positive z direction case 3, negative x direction

According to the right hand rule from figure 1, the propagation of the wave is along the x direction because the electric field is along the y direction and the magnetic field is along the z direction. In the second case, the propagation of the wave is along the +z direction because the electric field is along the x direction and the magnetic field is along the y direction. In the third case, the propagation of the wave is along the -x direction because the electric field is along the z direction and the magnetic field is along the y direction.