In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by $\widehat k$ and $2\widehat i - 2\widehat j$, respectively. What is the unit vector along direction of propagation of the wave?

Question

${1 \over {\sqrt 5 }}\left( {\widehat i + 2\widehat j} \right)$

${1 \over {\sqrt 5 }}\left( {2\widehat i + \widehat j} \right)$

${1 \over {\sqrt 2 }}\left( {\widehat i + \widehat j} \right)$

${1 \over {\sqrt 2 }}\left( {\widehat j + \widehat k} \right)$

Solution

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