Chapter 32, Problem 32.4E

Consider each of the following electric- and magnetic-field orientations. In each ease, what is the direction of propagation of the wave? (a) $\stackrel{\to }{E}=E\hat{i},\stackrel{\to }{B}=-B\hat{j}$; (b) $\stackrel{\to }{E}=E\hat{j},\stackrel{\to }{B}=B\hat{i}$; (c) $\stackrel{\to }{E}=-E\hat{k},\stackrel{\to }{B}=-B\hat{i}$; (d) $\stackrel{\to }{E}=E\hat{i},\stackrel{\to }{B}=-B\hat{k}$.