An `EM` wave is propagating in a medium whith a velocity `vecv=vhati`. The instantaneous oscillating electric field of this of em wave is along `+y` axis. Then the direction of oscillating magnetic field of the `EM` wave will be along

Options

A. `-Y `direction
B. `+Z` direction
C. `-Z `direction
D. `-x ` direction

Answer

B

Explanation

Direction of propagation of electromagnetic wave is given by `vecE xx vecB`
In this case direction of propagation is along X-axis and direction of instantaneous electric field is along positive Y-axis. Hence direction of magnetic field must be along positive Z-axis so that `vecE xxvecB` is along positive X-axis.
Hence option (b) is correct.