Question

Light wave is travelling along y-direction. If the corresponding $\overrightarrow{E}$ vector at any time along the $x-$axis, the direction of $\overrightarrow{B}$ vector at that time is along

• A. $y-$axis
• B. $x-$axis
• C. $z-$axis
• D. $-z-$axis

Answer 1

The correct option is C $z-$axis

Light wave is an electromagnetic wave in which $\overrightarrow{E}$ and $\overrightarrow{B}$ are at right angles to each other as well as at right angles to the direction of wave propagation. So from the given information in the question, the direction of $\overrightarrow{B}$ vector is in positive $z$ direction.