In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by k̂ and 2î – 2ĵ, respectively. What is the unit vector along direction of propagation of the wave.

<p>Propagation direction&nbsp;<strong>v? </strong> = <strong>E? </strong> × <strong>B? </strong>.<br><strong>v? </strong> = <strong>k? </strong> × (2<strong>i</strong>-2<strong>j</strong>) = 2 (<strong>k</strong>×<strong>i</strong>) - 2 (<strong>k</strong>×<strong>j</strong>) = 2<strong>j</strong> + 2<strong>i</strong>.<br>Unit vector is (<strong>i</strong>+<strong>j</strong>)/√2.</p>

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