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Electromagnetic Waves
Electromagnetic Waves – Directions of E, B and Propagation
1 question from 1 paper, each with its answer.
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- of Electromagnetic Waves
- 2.04%
Concepts tested
- E × B along direction of propagation
All Questions
2021 1 question
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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?For an EM wave, $\vec{E}$, $\vec{B}$ and the direction of propagation are mutually perpendicular, and $\vec{E} \times \vec{B}$ is along the direction of propagation ($\hat{i}$). For $\vec{E} = -\hat{j} + \hat{k}$ and $\vec{B} = -\hat{j} - \hat{k}$: $\vec{E} \times \vec{B} = 2\hat{i}$ (parallel to propagation) and $\vec{E} \perp \vec{B}$. In the other combinations $\vec{E} \times \vec{B} = 0$ (E and B parallel), so they are not possible.