Physics · 2019
JEE Main · 10 January 2019, Shift 2 · Q22
The electric field of a plane polarized electromagnetic wave in free space at time t=0 is given by an expression E (x, y)=10 j cos [(6 x+8 z)] The…
The electric field of a plane polarized electromagnetic wave in free space at time $\displaystyle t=0$ is given by an expression
$$\overrightarrow{\mathrm{E}}(x, y)=10 \hat{\mathrm{j}} \cos [(6 x+8 z)]
$$
The magnetic field $\displaystyle \overrightarrow{\mathrm{B}}(x, z, t)$ is given by: (c is the velocity of light)
Official answer
(1)
$\displaystyle \frac{1}{\mathrm{c}}(6 \hat{\mathrm{k}}-8 \hat{\mathrm{i}}) \cos [(6 x+8 z-10 \mathrm{c} t)]$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.