Question

An electromagnetic wave travels along z-axis. which of the following pairs of space and time varying fields would generate such a wave.

• A. $E_{X,}{B}_Y$
• B. $E_{Y,}{B}_X$
• C. $E_{Z,}{B}_X$
• D. $E_{Y,}{B}_Z$

Answer 1

The correct option is A $E_{X,}{B}_Y$

If electromagnetic wave travels in Z-direction.

We know that

$\overrightarrow{M}=\overrightarrow{E}\times \overrightarrow{B}$

$\overrightarrow{M}=\overrightarrow{E_x}\times \overrightarrow{B_y}$

So electric field $\to$ In x-direction

Magnetic field $\to$ In y-direction.