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  4. In an electromagnetic wave the electric field vector and magnetic field vector are given as vecE=E0 hati and vecB=B0 hatk respectively. The direction of propagation of electromagnetic wave is along:

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Q. In an electromagnetic wave the electric field vector and magnetic field vector are given as $\vec{E}=E_{0} \hat{i}$ and $\vec{B}=B_{0} \hat{k}$ respectively. The direction of propagation of electromagnetic wave is along:

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Solution:

Direction of propagation $=\vec{E} \times \vec{B}=\hat{i} \times \hat{k}=-\hat{j}$