Question

An em wave is propagating in a medium with a velocity $\overrightarrow{V}=V\hat{i}$. The instantaneous oscillating electric field of this em wave is along $+$y axis. Then the direction of oscillating magnetic field of the em wave will be along.

• A. $-$y direction
• B. $-$z direction
• C. $-$x direction
• D. $+$z direction

Answer 1

The correct option is D $+$z direction

Propagation of wave is in X direction $=\hat{i}$

Oscillation of electric field is in y direction $=\hat{j}$

SO direction of magnetic field is given by $=\hat{i}\times \hat{j}=\hat{k}$

So +z direction is correct answer option 4