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(B) The direction of propagation of an electromagnetic wave is given by the direction of the vector product $\vec{E} 	imes \vec{B}$.Given,the directi

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Positive $y$-direction

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(B) The direction of propagation of an electromagnetic wave is given by the direction of the vector product $\vec{E} 	imes \vec{B}$.Given,the direction of propagation is along the $+x$-axis,so $\hat{E} 	imes \hat{B} = \hat{i}$.We are given the magnetic field $\vec{B}$ is in the $z$-direction,so $\hat{B} = \hat{k}$.Let the electric field $\vec{E}$ be in the direction $\hat{n}$. Then $\hat{n} 	imes \hat{k} = \hat{i}$.Using the properties of unit vectors,we know that $\hat{j} 	imes \hat{k} = \hat{i}$.Therefore,the electric field $\vec{E}$ must be in the positive $y$-direction.

If an electromagnetic wave is propagating in the $x$-direction and the magnetic field $\vec{B}$ at any instant is in the $z$-direction,then at that instant,the electric field $\vec{E}$ will be in the ........ direction.

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