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(B) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is $\overrightarrow{S} = \frac{1}{\

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$E_y, B_z$

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(B) The direction of propagation of an electromagnetic wave is given by the direction of the Poynting vector,which is $\overrightarrow{S} = \frac{1}{\mu_0} (\overrightarrow{E} 	imes \overrightarrow{B})$.Thus,the direction of propagation is along $\overrightarrow{E} 	imes \overrightarrow{B}$.Given that the wave propagates along the $+x$ direction,we have $\hat{i} = \hat{E} 	imes \hat{B}$.If $\overrightarrow{E}$ is along the $y$-axis $(\hat{j})$ and $\overrightarrow{B}$ is along the $z$-axis $(\hat{k})$,then $\hat{j} 	imes \hat{k} = \hat{i}$.Therefore,the components of the electric field and magnetic field are $E_y$ and $B_z$ respectively.

$A$ plane electromagnetic wave propagates along the $+x$ direction in free space. The components of the electric field,$\overrightarrow{E}$ and magnetic field,$\overrightarrow{B}$ vectors associated with the wave in a Cartesian frame are:

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