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(C) 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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$+ve\,z-$ axis

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(C) 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 positive $y-$ axis,so the direction is $\hat{j}$.The direction of the magnetic field $\vec{B}$ is along the positive $x-$ axis,so the direction is $\hat{i}$.Let the direction of the electric field $\vec{E}$ be $\hat{n}$.Then,$\hat{n} 	imes \hat{i} = \hat{j}$.Using the properties of unit vectors in a Cartesian coordinate system,we know that $\hat{k} 	imes \hat{i} = \hat{j}$.Therefore,the electric field vibrates along the positive $z-$ axis.

Find the direction of vibration of the electric field if the vibration of the magnetic field is in the positive $x-$ axis and the propagation of the electromagnetic wave is along the positive $y-$ axis.

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