Question

The direction of propagation of electromagnetic wave is along

• A. Electric field vector, $\overset{ \rightarrow }{E}$
• B. Magnetic field vector, $\overset{ \rightarrow }{B}$
• C. $\overset{ \rightarrow }{E}\times \overset{ \rightarrow }{B}$
• D. $\overset{ \rightarrow }{B}\times \overset{ \rightarrow }{E}$

Answer 1

Answer: (C)

The direction of propagation of the electromagnetic wave is always perpendicular to the plane in which $\overset{ \rightarrow }{E}$ and $\overset{ \rightarrow }{B}$ lies. So the direction is along the direction of $\overset{ \rightarrow }{E}\times \overset{ \rightarrow }{B}$