PhysicsMedium120×since 2002Q6771In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by k^\widehat kk and 2i^−2j^2\widehat i - 2\widehat j2i−2j, respectively. What is the unit vector along direction of propagation of the wave?A15(i^+2j^){1 \over {\sqrt 5 }}\left( {\widehat i + 2\widehat j} \right)51(i+2j)B15(2i^+j^){1 \over {\sqrt 5 }}\left( {2\widehat i + \widehat j} \right)51(2i+j)C12(i^+j^){1 \over {\sqrt 2 }}\left( {\widehat i + \widehat j} \right)21(i+j)D12(j^+k^){1 \over {\sqrt 2 }}\left( {\widehat j + \widehat k} \right)21(j+k)Check answerSkip