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Question: Answered & Verified by Expert
If $E$ and $B$ represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along
PhysicsElectromagnetic Waves
Options:
  • A
    $E$
  • B
    $\mathrm{B}$
  • C
    $\mathrm{B} \times \mathrm{E}$
  • D
    $\mathrm{E} \times \mathrm{B}$
Solution:
2344 Upvotes Verified Answer
The correct answer is:
$\mathrm{E} \times \mathrm{B}$
The direction of propagation of electromagnetic wave is perpendicular to both electric field $\mathrm{E}$ and magnetic field $B$, i.e., in the direction of $\mathrm{E} \times \mathrm{B}$ by right thumb rule. The diagram given below


So, electromagnetic wave is along the $z$-direction which is give the cross product of $\mathrm{E}$ and $\mathrm{B}$ direction is perpendicular to $\mathrm{E}$ and $\mathrm{B}$ from $\overrightarrow{\mathrm{E}}$ to $\overrightarrow{\mathrm{B}}$. i.e., $(\mathrm{E} \times \mathrm{B})$ in z-direction.

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