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# Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c$ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the direction of motion ?

$\begin{array}{1 1} - \hat j \\ - \hat k \\ -\hat i \\ none\;of \;the \;above \end{array}$

From the given equation it is understood that the direction of motion of electro magnetic wave is along the negative y direction (ie) along $-\hat j$