Question

If the directions of electric and magnetic field vectors of a plane electromagnetic wave are along positive $y$-direction and positive $z$-direction respectively, then the direction of propagation of the wave is along:

• A. positive $z$-direction
• B. negative $z$-direction
• C. negative $y$-direction
• D. positive $x$-direction
• E. negative $x$-direction

Answer 1

The correct option is D positive $x$-direction

$e=E\times B$, direction of propagation is always perpendicular to plane of $E$ and $B$. It will be positive in $x$-direction.