& is along the X axis and M is along the y axis never payed attention to those questions. is along the and M is along the 'axis Let the game answer it for you When EM Wave's travel in a vacuum in Z direction. __

When an electromagnetic (EM) wave travels in a vacuum in the Z direction, the electric field (E) and the magnetic field (M) are perpendicular to each other and to the direction of propagation (Z). Therefore:* **E is along the X axis** and **M is along the Y axis** (or vice versa; E and M can swap axes, but must remain perpendicular to each other and Z).