Physics · 2020
JEE Main · 3 September 2020, Shift 2 · Q15
The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is E = E_0 j cos (ω t - k x). The magnetic field B, at…
The electric field of a plane electromagnetic wave propagating along the $\displaystyle x$ direction in vacuum is $\displaystyle \overrightarrow{\mathrm{E}}=\mathrm{E}_0 \hat{j} \cos (\omega \mathrm{t}-\mathrm{k} x)$. The magnetic field $\displaystyle \overrightarrow{\mathrm{B}}$, at the moment $\displaystyle \mathrm{t}=0$ is :
Official answer
(1)
$\displaystyle \overrightarrow{\mathrm{B}}=\mathrm{E}_0 \sqrt{\mu_0 \epsilon_0} \cos (\mathrm{k} x) \hat{k}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.