A place electromagnetic wave is propagating along the direction `(hati + hatj)`, then which of the following is the direction of the magnetic field component.

Options

A. `(-hati + hatj)`
B. `(hati - hatj)`
C. `(-hati - hatj)`
D. `(hati + hatj)`

Answer

A

Explanation

The magnetic field component is perpendicular to the direction of propagation and the direction of electric field. Using vector algebra `E xx B` should be in `z`-direction.
`:. (hati + hatj) xx (-hati + hatj) = 2hatk`