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Q.

In a plane electromagnetic wave, the directions of electric filed and magnetic field are represented by  k^  and  2i^−2j^, respectively. What is the unit vector along direction of propagation of the wave.

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a

152i^+j^

b

12j^+k^

c

12i^+j^

d

15i^+2j^

answer is C.

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Detailed Solution

P^=E^×B^​Where P^=  Unit vector along propagation direction​⇒P^=K^×2i^−2j^22​⇒P^=12j^+i^
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