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STD 12 - 8. Electromagnetic waves — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 8. Electromagnetic waves4 Marks
MCQ
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
    $\hat{j}+\hat{k}, \hat{j}+\hat{k}$
  • ✓
    $-\hat{j}+\hat{k},-\hat{j}-\hat{k}$
  • C
    $\hat{j}+\hat{k},-\hat{j}-\hat{k}$
  • D
    $-\hat{j}+\hat{k},-\hat{j}+\hat{k}$
✓

Answer

Correct option: B.
$-\hat{j}+\hat{k},-\hat{j}-\hat{k}$
b
Wave in $x$ direction

$C=\vec{E} \times \vec{B}$

$(-\hat{j}+\hat{k}) \times(-\hat{j}-\hat{k})$

$=\hat{i}+\hat{i}$

$=2 \hat{i}$

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