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Questions  >>  CBSE XII  >>  Physics  >>  Electromagnetic waves
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Q)

An electro magnetic wave travels in vacuum along z direction $\overrightarrow{E}=(E_1 \hat i +E_2 \hat j) \cos (kz- wt)$ Choose the correct option from the following

$\begin{array}{1 1} \text{The given electro magnetic field is circularly polarized} \\ \text{The given electro magnetic wave is plane polarized} \\ zero \\ \text{none of these} \end{array} $

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A)
Solution :
It is given that $\overrightarrow{E}=(E_1 \hat i +E_2 \hat j) \cos (kz- wt)$
In EM wave that associate magnetic field vector $\overrightarrow{B} = \large\frac{$\overrightarrow{E}}{C}=\frac{E_1 \hat i +E_2 \hat j}{C}$$ \cos (Kz-wt)$ option a is true
Also $\overrightarrow{E}$ and $\overrightarrow{B}$ are perpendicular to each other and the propagation of EM wave is perpendicular to $\overrightarrow{E}$ as well as $\overrightarrow{B}$
The given electro magnetic wave is plane polarized
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