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8.Electromagnetic waves
medium
For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field $(E)$ and magnetic field $(B)$ respectively?
A
$\hat{j}+\hat{k}, \hat{j}+\hat{k}$
B
$-\hat{j}+\hat{k},-\hat{j}-\hat{k}$
C
$\hat{j}+\hat{k},-\hat{j}-\hat{k}$
D
$-\hat{j}+\hat{k},-\hat{j}+\hat{k}$
(NEET-2021)
Solution
Wave in $x$ direction
$C=\vec{E} \times \vec{B}$
$(-\hat{j}+\hat{k}) \times(-\hat{j}-\hat{k})$
$=\hat{i}+\hat{i}$
$=2 \hat{i}$
Standard 12
Physics
