The electric field of a plane electromagnetic wave propagating along the $x$ direction in vacuum is $\overrightarrow{ E }= E _{0} \hat{ j } \cos (\omega t - kx )$. The magnetic field $\overrightarrow{ B },$ at the moment $t =0$ is :
The electric field of a plane electromagnetic wave propagating along the $x$ direction in vacuum is $\overrightarrow{ E }= E _{0} \hat{ j } \cos (\omega t - kx )$. The magnetic field $\overrightarrow{ B },$ at the moment $t =0$ is :
- [JEE MAIN 2020]
- A
$\overrightarrow{ B }= E _{0} \sqrt{\mu_{0} \epsilon_{0}} \cos ( kx ) \hat{ j }$
- B
$\overrightarrow{ B }=\frac{ E _{0}}{\sqrt{\mu_{0} \epsilon_{0}}} \cos ( kx ) \hat{ k }$
- C
$\overrightarrow{ B }= E _{0} \sqrt{\mu_{0} \epsilon_{0}} \cos ( kx ) \hat{ k }$
- D
$\overrightarrow{ B }=\frac{ E _{0}}{\sqrt{\mu_{0} \in_{0}}} \cos ( kx ){\hat{j}}$
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