Q. The figure here gives the electric field of an EM wave at a certain point and a certain instant. The wave is transporting energy in the negative $z$ direction. What is the direction of the magnetic field of the wave at that point and instant
A) Towards + $X$ direction
B) Towards $- X$ direction
C) Towards + $Z$ direction
D) Towards $- Z$ direction
Explanation
(a) The direction of EM wave is given by the direction of $\overrightarrow{E} \times \overrightarrow{B}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.