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# In an electromagnetic wave the electric field vector

Question:

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

1. $(\hat{\mathrm{k}})$

2. $\hat{J}$

3. $(-\hat{\mathrm{k}})$

4. $(-\hat{j})$

Correct Option: , 4

Solution:

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